736 results on '"International Institute of Tropical Agriculture (IITA)'
Search Results
2. Assessment of Land Degradation in Semi-Arid Zone of Central Tanzania
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Reith, Jonathan; Dubovky, Olena; Muthoni, Francis; Kimaro, Anthony; Swai, Elirehema, International Institute of Tropical Agriculture (IITA); University of Bonn, Germany, Reith, Jonathan; Dubovky, Olena; Muthoni, Francis; Kimaro, Anthony; Swai, Elirehema, and International Institute of Tropical Agriculture (IITA); University of Bonn, Germany
- Abstract
Africa RISING, A sub-national field assessment of land degradation was conducted in the Kongwa districts of Tanzania in December 2019. 34 sampling plots were selected using a stratified sampling method based on a land cover map. One site that hosts Africa RISING technologies on land rehabilitation was purposely selected to act as a control. The primary sampling plots measured 100*100m and were subdivided into replicate sub-plots measuring 30x30m. A sub-sample of 3 sub-plots was selected in each primary plot for assessment of land degradation. The observations from 3 subplots (30*30) were averaged to obtain an aggregate value for the larger plot (100x100m). The antecedent biophysical conditions in the sampling plot were recorded i.e. the land use, degree of slope, topographical position, soil color, crop types grown and land tenure. The percentage of area that was undegraded in each plot was also estimated visually. A questionnaire for mapping land degradation and sustainable land management was applied for visual assessment of the type, extent, degree, and direct causes of land degradation. The different types of land degradation, for example erosion by water, were scored whether they are present or not, in addition to their extent and degree (intensity). The extent represented the proportion of a sub-plot covered by different types of land degradation, the degree was divided into 4 classes in ascending order of intensity of land degradation (0 = Light, 1 = Moderate, 2 = Strong, 3 = Severe). Moreover, the type, purpose, extent, and effectiveness of sustainable land management practices (SLM) were visually assessed in every subplot. Data were recorded using the mobile-based KoboCollect toolbox and transmitted to a cloud database for storage and descriptive analysis.
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- 2021
3. Gender Evaluation of Tomato and Eggplant in Koutiala and Bougouni Districts in Mali
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International Institute of Tropical Agriculture (IITA) and International Institute of Tropical Agriculture (IITA)
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IFPRI1; Africa Rising, Through research and scaling, Africa RISING strives to create opportunities for smallholder farm households to move out of hunger and poverty. However, knowledge about gendered differences in the adoption of intensification practices is still limited and often based on results from quantitative studies only. The Gender Evaluation of Tomato and Eggplant in Southern Mali study is conducted to gain an in-depth understanding of gender issues around the cultivation of tomatoes and eggplants. The data set covers demographic information, general farm system description, market participation, gender and household processes of 75 tomato and eggplant farmers in the Koutiala and Bougouni district of Southern Mali. The main data generation strategy of this study was focus group discussions.
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- 2021
4. Bridging the Information Gap for Increased Livestock Productivity in Tanzania
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International Institute of Tropical Agriculture (IITA); International Livestock Research Institute (ILRI) and International Institute of Tropical Agriculture (IITA); International Livestock Research Institute (ILRI)
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IFPRI1; Africa Rising, This dataset is generated from the study conducted to evaluate the effect of information and communications technology (ICT) based extension services on knowledge, attitudes, and practices among smallholder farmers in Tanzania. A baseline survey of randomly selected 100 dairy farmers was conducted to collect information on the basic characteristics of the sample. After the baseline survey, short and clear messages about dairy and poultry production were disseminated over 14 weeks using the MWANGA platform, a short message service. An endline survey along with focus group discussion was conducted at five sites in the Babati District of Tanzania. Data collected included uptake of improved forages, knowledge in the use of forages and animal husbandry, and practices in animal production among others.
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- 2021
5. Integrating Livestock Into Agricultural Systems for Increased Livestock Productivity in Tanzania
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International Institute of Tropical Agriculture (IITA); International Livestock Research Institute (ILRI) and International Institute of Tropical Agriculture (IITA); International Livestock Research Institute (ILRI)
- Abstract
IFPRI1; Africa Rising, This dataset is generated from the study conducted to evaluate the impact of improved Napier grass and maize stover based diets on milk yield under smallholder conditions. Farms were used as experimental units and lactating cows were used as replicates. 23 farmers from six villages participated in the trial. 24 lactating cows with two genotypes (local and improved cattle) were selected and were fed with Napier grass or maize stover based diets supplemented with bean haulms at different levels (100, 80, 70, and 60%). Data were collected for 45 days with a 7-day adjustment. Data included information on breed type, fodder, supplementation type, pre-study fodder type, milk production, lactation length, source of feed, and feed and water intake among others.
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- 2021
6. Gender Evaluation of Maize Leaf Stripping Practices in Northern Ghana
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International Institute of Tropical Agriculture (IITA) and International Institute of Tropical Agriculture (IITA)
- Abstract
IFPRI1; Africa Rising, Through research and scaling, Africa RISING strives to create opportunities for smallholder farm households to move out of hunger and poverty. However, knowledge about gendered differences in the adoption of intensification practices is still limited and often based on results from quantitative studies only. The evaluation is to gain an in-depth understanding of gender issues surrounding the adoption and sustainability of maize leaf stripping technologies on the household as well as community level. This includes an understanding of intra-household decision-making and labor allocation; access to resources, participation as well as benefit-sharing among male and female households and community members. The data covers basic demographic information, general farm system description, gender and household processes, and market participation of 60 farmers involved in maize leaf stripping in Northern Ghana. The main data generation strategy of this study was focus group discussions.
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- 2021
7. Gender Evaluation of Cowpea Living Mulch in Northern Ghana
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International Institute of Tropical Agriculture (IITA) and International Institute of Tropical Agriculture (IITA)
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IFPRI1; Africa Rising, This dataset is generated from the research study conducted to understand gender issues surrounding the adoption and sustainability of living mulch technologies at the household as well as community level. The survey was conducted among farmers who were practicing living mulch in Northern Ghana. Data were collected from 77 farmers in 12 communities across six districts from Jan-Feb, 2019. The data collected include demographic information, general farm system description, gender and household processes, and market participation among others. The main data generation strategy of this study was focus group discussions.
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- 2021
8. Leaf Stripping to Maximize Food and Feed Yields from Maize-Based Cropping Systems, Ghana
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International Institute of Tropical Agriculture (IITA) and International Institute of Tropical Agriculture (IITA)
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IFPRI1; Africa Rising, Feed shortages during the cropping season constrain to livestock production in small-scale crop-livestock systems in northern Ghana. The effect of stripping the lower leaves of maize at tasseling and silking to feed livestock on grain and stover yields of maize was tested over two years in northern Ghana.
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- 2019
9. Variety and Planting Density Effects on Grain and Fodder Yield of Groundnut, Ghana
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International Institute of Tropical Agriculture (IITA) and International Institute of Tropical Agriculture (IITA)
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IFPRI1; Africa Rising, Groundnut is the most important food and feed crop in West Africa. Grain and fodder yields on farmers field in Ghana are low due to limited use of improved varieties and inappropriate agronomic practices such as low planting densities. An on-farm was conducted over a three-year period to evaluate the effect of plant density on grain and fodder yields of improved groundnut varieties in northern Ghana.
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- 2019
10. Making Seed Systems and Markets for Vegetatively Propagated Crops (VPCs) Work for the Poor: A Cross-Country Study of Kenya, Nigeria, and Vietnam
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Abdoulaye, Tahirou; Assfaw, Tesfamicheal; Atieno, Elly O.; Bartle, Brian; Gatto, Marcel; Gonzalez, Laura; Hareau, Guy; Labarta, Ricardo; Phuong Le, Dung; Maredia, Mywish; Mbiri, Daniel G.; McEwan, Margaret A.; Okello, Julius J.; Omondi, Bonaventure A.; Pacillo, Grazia; Spielman, David J., International Food Policy Research Institute (IFPRI); International Center for Tropical Agriculture (CIAT); International Institute for Tropical Agriculture (IITA); International Potato Center (CIP); Michigan State University (MSU), Abdoulaye, Tahirou; Assfaw, Tesfamicheal; Atieno, Elly O.; Bartle, Brian; Gatto, Marcel; Gonzalez, Laura; Hareau, Guy; Labarta, Ricardo; Phuong Le, Dung; Maredia, Mywish; Mbiri, Daniel G.; McEwan, Margaret A.; Okello, Julius J.; Omondi, Bonaventure A.; Pacillo, Grazia; Spielman, David J., and International Food Policy Research Institute (IFPRI); International Center for Tropical Agriculture (CIAT); International Institute for Tropical Agriculture (IITA); International Potato Center (CIP); Michigan State University (MSU)
- Abstract
IFPRI1; CRP2; Open Access, EPTD; PIM, CGIAR Research Program on Roots, Tuber, and Bananas (RTB); CGIAR Research Programs on Policies, Institutions, and Markets (PIM), Many developing-country farmers cultivating vegetatively propagated crops (VPCs)—crops such as cassava, potato, sweetpotato, and yam—face constrained access to quality planting material. This challenge is distinct from the challenges facing cereal crops, and is associated with both the unique biological and economic nature of vegetative propagation. Although technological solutions exist, there are other limiting factors relating to policies, institutions, and markets that shape VPC seed systems, e.g., quality assurance mechanisms, certification regulations, sanitary and phytosanitary standards, and plant variety protection. This research project aims to provide actionable evidence on policy and investment options to accelerate seed system and market development in countries where VPCs are important to food security and agricultural development. By taking a collaborative and multidisciplinary approach to the research, the project (1) analyzes current policy initiatives and success factors underpinning models that incentivize cost-effective multiplication and distribution of VPC seed to smallholders; and (2) develops a set of crop-specific case studies in Kenya, Nigeria, and Vietnam that encourage closer consideration of more appropriate policy options. This document provides a brief summary of the project and accompanies the key informant interview guides to collect data for analysis purposes.
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- 2019
11. Gender Implications of the Introduction of Forage Chopper Machines in Babati, Tanzania
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International Institute of Tropical Agriculture (IITA); International Livestock Research Institute (ILRI) and International Institute of Tropical Agriculture (IITA); International Livestock Research Institute (ILRI)
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IFPRI1; Africa Rising, In 2015, livestock scientists implementing Africa RISING research-in-development activities (R-in-D) introduced forage chopper machines in seven villages in Babati District, northern Tanzania. The dataset included in this study was generated from the research conducted an year later to understand the gender implications of the new processing practices. The survey was conducted among households who used forage chopper machines and included questions about intra-household decision-making, previous knowledge of the technology, training, and willingness to pay among many others. Altogether 53 male and female respondents were selected for the survey.
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- 2018
12. Whole-farm Model: Detailed Data on Nine Farms for Impact Assessment of Africa RISING Technologies
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Wageningen University and Research (WUR); International Institute of Tropical Agriculture (IITA) and Wageningen University and Research (WUR); International Institute of Tropical Agriculture (IITA)
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IFPRI1; Africa Rising, The zip.file contains the Farm DESIGN model (software) as well as the input data. A user manual of the software is available online (https://sites.google.com/site/farmdesignmodel/download). The zipped Farm DESIGN model contains the whole-farm representation of nine farms in Northern Ghana. A low, medium and a high resource endowed farm per site, namely in Duko (Northern Region), Nyangua (Upper East) and Zanko (Upper West). There are several models per farm: 1. The current/ actual farm configuration 2. The baseline (reset to a situation with traditional (no Africa RISING) farming practices) 3. The farm, where Africa RISING Package 1 (Maize) is implemented 4. The farm, where Africa RISING Package 2 (Cowpea) is implemented 5. The farm, where Africa RISING Package 3 (Soybean) is implemented 6. The farm, where Africa RISING Package 4 (Maize-Legume Rotation) is implemented 7. The farm, where Africa RISING Package 5 (Maize-Legume Strip Crop) is implemented 8. A farm-model that is ready for an exploration (containing additional options the model may choose)
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- 2018
13. Focus Group Discussions-Agrobiodiversity Assessment
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International Institute of Tropical Agriculture (IITA); International Food Policy Research Institute (IFPRI) and International Institute of Tropical Agriculture (IITA); International Food Policy Research Institute (IFPRI)
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IFPRI1; Africa Rising, The project aimed at testing the hypothesis that the application of sustainable intensification technologies (cereal-legume-vegetable-livestock integrated systems) by smallholder households in North Ghana changes the level of inter and intra-specific crop diversity managed on-farm at household level. The project included two main activities: (1) analyses of the baseline socioeconomic survey data gathered by IFPRI and IITA from a diversity perspective; and (2) implementation and analysis of a series of focus group discussions in 12 communities to assess the overall diversity of plant species that households manage and derive benefits from. Study title: Focus Group Discussions-Agrobiodiversity Assessment Study description: A series of FGDs in 12 communities were carried out during the earlier part of 2016. The objective of FGDs on agricultural biodiversity was to elicit the local knowledge about the agricultural and useful wild biodiversity present in the study areas in order to generate: (a) an ordered inventory (list) of all useful plants used by local communities for human food, animal feed, medicine, fuel, etc. and their local names; and (b) an inventory of species and other products bought and sold in markets that people attend. The aim was to have a subjective assessment of the overall diversity of species households manage and derive benefits from, how important each species is and how it contributes to the household?s food and income, as well as how it is used. Project website: http://africa-rising.net
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- 2017
14. Management of Maize Lethal Necrosis (MLN) in Tanzania
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Selian Agricultural Research Institute (SARI); International Institute of Tropical Agriculture (IITA) and Selian Agricultural Research Institute (SARI); International Institute of Tropical Agriculture (IITA)
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IFPRI1; Africa Rising, This study contains data about mapping prevalence, incidence, and severity of MLN in northern Tanzania. Project title: Integrated Approaches to Manage Maize Lethal Necrosis (MLN) Disease in Tanzania Project abstract: Mapping prevalence, incidence and severity of MLN in northern Tanzania. Project website: http://africa-rising.net
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- 2017
15. Dietary intakes, vitamin A, and iron status of women of childbearing age and children 6-59 months of age from Akwa Ibom state in Nigeria
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International Institute Of Tropical Agriculture (IITA) and HarvestPlus, International Food Policy Research Institute (IFPRI)
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- 2015
- Full Text
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16. Africa RISING-Spraying Regime Effects on the Grain Yield of Cowpea Varieties in Northern Ghana
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International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, Project title: Africa RISING-Spraying Regime Effects on the Grain Yield of Cowpea Varieties in Northern Ghana. Project abstract: The data set evaluate adaptability and suitability of cowpea varieties to different ecozones. Project website: http://africa-rising.net http://africa-rising.net/where-we-work/west-africa
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- 2016
17. Improved Crop Varieties, Agronomic Practices, Soil Water Conservation Practices
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International Maize and Wheat Improvement Center (CIMMYT); International Institute of Tropical Agriculture (IITA); International Center for Tropical Agriculture (CIAT); World Agroforestry Centre (ICRAF);Hombolo Agricultural Research Institute (ARI-Hombolo);Selian Agricultural Research Institute (SARI) and International Maize and Wheat Improvement Center (CIMMYT); International Institute of Tropical Agriculture (IITA); International Center for Tropical Agriculture (CIAT); World Agroforestry Centre (ICRAF);Hombolo Agricultural Research Institute (ARI-Hombolo);Selian Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, Establishment of demonstration plots on improved crop varieties (maize, groundnuts, soybeans and beans) and best-bet agronomic pratices and soil and water conservation practices in Babati, Kongwa, kiteto, Mvomero, Mbozi, Kilosa and Kilolo in Tanzania. Training of lead farmers and extension staff to empower them with knowledge on improved technologies so that they can also train others. This study contains data from different cereal legume rotation systems in northern Ghana. Project title: Enhancing Partnership among Africa RISING (AR), NAFAKA and TUBORESHE CHAKULA (TUBOCHA) Programs for Fast-Tracking Delivery and Scaling of Agricultural Technologies in Tanzania. Project abstract: This project is implemented in partnership between Africa RISING research team and NAFAKA and focuses on scaling of agricultural technologies that include deployment of improved maize varieties and legumes (beans, soybean, groundnuts), deployment of improved water and soil conservation practices and improved good agricultural practices in Babati, Kongwa, Kiteto, Kilosa, Mvomero, Mbozi and Kilolo districts of Tanzania. The project is implemented by CIMMYT, IITA, CIAT, ICRAF, ARI-Hombolo, AMINATA Quality Seeds compnay, Meru Agro-Tours and Cosultants seed company, NAFAKA and Selian Agricultural Research Institute. Project website: http://africa-rising.net
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- 2016
18. Africa RISING-On-Farm Testing and Dissemination of Combination of Technologies in Northern Ghana
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International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA); Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA); Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, Project title: On-Farm Testing and Dissemination of Combination of Technologies. Project abstract: This project was conceived with the goal to evaluate the performance and farmers' preference for early maize varieties through on farm testing and dissemination of combination of technologies. Project website: http://africa-rising.net http://africa-rising.net/where-we-work/west-africa
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- 2016
19. Food Fortification Practices and Awareness
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International Institute of Tropical Agriculture (IITA) and International Institute of Tropical Agriculture (IITA)
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IFPRI1; Africa Rising, The postharvest management research of Africa RISING focuses on testing innovative postharvest handling, processing and storage technologies to reduce postharvest loss and increase the quality and market value of maize. The goal is to improve the income and nutritional status of smallholder farmers. Project title: Postharvest Management Research of Africa RISING in Tanzania. Project abstract: The project focuses on post-harvest research including fortification practices and awareness. Project website: http://africa-rising.net
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- 2016
20. Africa RISING-Cowpea Baby Trial in Northern Ghana
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International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, Project title: Cowpea Baby Trial in Northern Ghana Project abstract: This project aims to evaluate the performance of cowpea varieties by farmers. Project website: http://africa-rising.net
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- 2016
21. Africa RISING - A Two Year Cereal Legume in Northern Ghana
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International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, This study contains data from different cereal legume rotation systems in northern Ghana. Project title: A Two Year Cereal Legume Rotation in Northern Ghana Project abstract: This project compares different cereal legume rotation systems and determines farmers' preferences. Project website: http://africa-rising.net http://africa-rising.net/where-we-work/west-africa
- Published
- 2016
22. Africa RISING Tanzania- Integrated Pest Management (IPM) of Vegetables
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World Vegetable Center (AVRDC); International Institute of Tropical Agriculture (IITA) and World Vegetable Center (AVRDC); International Institute of Tropical Agriculture (IITA)
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IFPRI1; Africa Rising, This study contains data on pest and disease incidence. Project title: Africa RISING. Project abstract: The aim of the Africa RISING project in Kongwa and Kiteto Districts, Tanzania is to provide a scientific basis for sustainably intensifying agricultural production in semi-arid areas of central Tanzania. The project activities are falls under 4 thematic areas that address three critical elements of sustainable intensification (SI), i.e. genetic, ecological and socio-economic intensification technologies. The scope of activities being implemented includes: packaging of new legume and cereal varieties with over 120% yield advantage, packaging and validation of integrated productivity-enhancing technologies for cereals, legumes, legume trees and soil health technologies, food safety primarily to reduce aflatoxin contamination and integration of livestock into the cropping systems. The innovation platform is used to set R4D priority in the active sites. In the 2013-2014 season, we reached out to about 1217 farmers Kongwa and Kiteto districts. In 2014 we plan to reach out to about 1500 new farmers. The project team is comprised of national partners (e.g. ARI-Hombolo, District Agricultural Officers, SUA and UDOM) and CG Partners (CIMMYT and ICRAF) under the leadership of ICRISAT. Project website: http://africa-rising.net
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- 2016
23. Test and Disseminate Technologies to Intensity Vegetable Mono-cropping
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International Institute for Tropical Agriculture (IITA); World Vegetable Center (AVRDC); Savanna Agricultural Research Institute (SARI) and International Institute for Tropical Agriculture (IITA); World Vegetable Center (AVRDC); Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, This data study explores integrating vegetable into cereal-legume cropping productions systems in Ghana. Project title: AfricaRISING - Sustainable Intensification of Cereal-based Farming Systems in the Guinea-Sudan-Savanna of Ghana and Mali. Project abstract: Four vegetable crops will be compared across subsets of 30-50 households in each of the 3 northern regions using two planting densities and they are Amaranth for Upper West Region, Jute Mallow for the Northern region and Roselle for the Upper East region. Three fruit vegetables (Okra in all the regions), African eggplant and tomato in the other two regions and one spice vegetable (Pepper), in all the three regions. Project website: http://africa-rising.net
- Published
- 2015
24. Africa RISING-Yield of Maize-Vegetable Intercrop in Northern Ghana
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International Institute of Tropical Agriculture (IITA); World Vegetable Center (AVRDC); Savanna Agricultural Research Institute (SARI); Ministry of Food and Agriculture (MOFA), Republic of Ghana and International Institute of Tropical Agriculture (IITA); World Vegetable Center (AVRDC); Savanna Agricultural Research Institute (SARI); Ministry of Food and Agriculture (MOFA), Republic of Ghana
- Abstract
IFPRI1; Africa Rising, Project title: Africa RISING-Yield of Maize-Vegetable Intercrop as Influenced by Varying Plant Densities in Northern Ghana. Project abstract: The project aims i) to determine the effect of insect/pest and diseases on maize vegetable intercropping and ii) to determine farmer preferences and cost benefit analysis. Project website: http://africa-rising.net http://africa-rising.net/where-we-work/west-africa
- Published
- 2015
25. Africa RISING-Soybean Baby Trial in Northern Ghana
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International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, This data study contains three-year data from three northern regions of Ghana which were collected to evaluate and demonstrate soybean practices.
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- 2015
26. Testing and Dissemination of Improve Varieties and Agronomic Practices Using the 'Mother-Baby' Approach
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International Institute of Tropical Agriculture (IITA); Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, This study explores raising and sustaining productivity in cereal-legume cropping systems in northern Ghana. Project title: AfricaRISING - Sustainable Intensification of Cereal-Based Farming Systems in the Guinea-Sudan-Savanna of Ghana and Mali. Project abstract: In 2013, four mother-baby trials started to test and demonstrate crop variety and combinations of variety and agronomic options will continue for the second year. A split-plot design replicated in 4-6 communities per region will be used in the trials with 30 babies per community for each mother trial. Project website: https://africa-rising.net
- Published
- 2015
27. Monitoring Adoption Survey
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International Institute of Tropical Agriculture (IITA); International Maize and Wheat Improvement Center (CIMMYT); Zambia Agriculture Research Institute (ZARI) and International Institute of Tropical Agriculture (IITA); International Maize and Wheat Improvement Center (CIMMYT); Zambia Agriculture Research Institute (ZARI)
- Abstract
IFPRI1; Africa Rising, Project title: SIMLEZA-AR Project website: http://africa-rising.net
- Published
- 2015
28. Raising and Sustaining Productivity in Cereal-Legume Cropping Systems in Northern Ghana
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International Institute of Tropical Agriculture (IITA); Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, This data study explores raising and sustaining productivity in cereal-legume cropping systems in northern Ghana. Mamprusi districts in the Northern region and Guru and Builsa district in Upper East region Presbyterian Agricultural Services. However, Zia farming is an innovative technology which involves the burial of manure/organic matter in holes/ pits and planting the crop later on top of the pit. The objectives of this study are to evaluate and disseminate the Zia and fertilizer Micro-dosing techniques on-farm; to undertake cost benefit analysis of the Zia and fertilizer Micro-dosing; to explore the potential increase in grain yield of Zia and fertilizer Micro-dosing over farmers practice in the Africa RISING intervention communities; to undertake comparative analysis of the effect of Zia and fertilizer Micro-dosing on maize,sorghum, and millet. Project website: http://africa-rising.net http://africa-rising.net/where-we-work/west-africa
- Published
- 2015
29. Africa RISING-Effects of P-Fertilizer Rates on Groundnut Yield in Northern Ghana
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International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Ministry of Food and Agriculture (MOFA), Republic of Ghana; Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, Project title: Africa RISING-Effects of P-Fertilizer Rates on Groundnut in Northern Ghana. Project abstract: The data set evaluates adaptability and suitability of groundnut varieties to different ecozones. Project website: http://africa-rising.net http://africa-rising.net/where-we-work/west-africa
- Published
- 2015
30. Crop Diversification in Maize-Based Cropping System: Maize-Sesame Intercropping
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International Institute of Tropical Agriculture (IITA); Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, This data study explores raising and sustaining productivity in cereal-legume cropping systems in northern Ghan. Project title: AfricaRISING - Sustainable intensification of cereal-based farming systems in the Guinea-Sudan-Savanna of Ghana and Mali. Project abstract: Mono-cropping of sesame(Sesame indicum L.) is being promoted for cash to diversify smallholder income in the northern Ghana. The objective of this activity is to evaluate agronomic options for integrating sesame into maize, sorghum, and millet cropping systems. A split-plot design replicated in 3-4 communities per region will be used within row spacing 1 and 2 weeks after planting maize. For the trials, data will be collected on growth of maize and sesame, light interception/leaf area index, weed diversity and biomass, grain yield of maize and sesame, soil temperature, soil moisture, and plant pest and diseases. Output and input will be collected for cost benefit analysis. Project website: https://africa-rising.net
- Published
- 2015
31. Scaling-Up Sustainable Cropping Practices: 'Zia' and 'Micro-dosing'
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International Institute of Tropical Agriculture (IITA); Savanna Agricultural Research Institute (SARI) and International Institute of Tropical Agriculture (IITA); Savanna Agricultural Research Institute (SARI)
- Abstract
IFPRI1; Africa Rising, This data study explores raising and sustaining productivity in cereal-legume cropping systems in northern Ghana. About the project. Project title: AfricaRISING - Sustainable Intensification of Cereal-Based Farming Systems in the Guinea-Sudan-Savanna of Ghana and Mali. Project abstract: In Ghana, Zia has been successfully been introduced on a limited scale to farmers in the East Gonja, East Mamprusi districts in the Northern region and Guru and Builsa district in Upper East region Presbyterian Agricultural Services. However, Zia farming is an innovative technology which involves the burial of manure/organic matter in holes/ pits and planting the crop later on top of the pit. The objectives of this study are to evaluate and disseminate the Zia and fertilizer Micro-dosing techniques on-farm; to undertake cost benefit analysis of the Zia and fertilizer Micro-dosing; to explore the potential increase in grain yield of Zia and fertilizer Micro-dosing over farmers practice in the Africa RISING intervention communities; to undertake comparative analysis of the effect of Zia and fertilizer Micro-dosing on maize,sorghum, and millet. Project website: http://africa-rising.net http://africa-rising.net/where-we-work/west-africa
- Published
- 2015
32. Dietary intakes, vitamin A, and iron status of women of childbearing age and children 6-59 months of age from Akwa Ibom state in Nigeria
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International Institute of Tropical Agriculture (IITA); HarvestPlus of International Food Policy Research Institute (IFPRI) and International Institute of Tropical Agriculture (IITA); HarvestPlus of International Food Policy Research Institute (IFPRI)
- Abstract
IFPRI1; CRP4; Open Access, HarvestPlus; A4NH, CGIAR Research Program on Agriculture for Nutrition and Health (A4NH), HarvestPlus, part of the CGIAR Research Program on Agriculture for Nutrition and Health (A4NH), seeks to improve the nutrient density of staple food crops through conventional plant breeding.the nutrient density of staple food crops through conventional plant breeding. In 2011, three first-wave varieties of yellow cassava, containing 6-7 ppm of provitamin A, were released in Nigeria, while the full target (15 ppm of provitamin A) varieties are expected to be released in 2015/2016. Initially, the target levels of provitamin A in cassava were set by using rough estimates on cassava intake (grams/day); bioconversion, the retinol equivalency of provitamin A carotenoids, and losses of provitamin A during processing and cooking. However, accurate information on the above parameters were needed to confirm our initial assumptions. A study on bioconversion was performed as well as retention studies. In the present study we aimed to assess the cassava intake and the vitamin A deficiency among women and preschool children in Nigeria. Therefore, we conducted a cross-sectional survey in rural to moderately-urbanized areas of Akwa-Ibom, a state identified as having high cassava consumption and high prevalence of vitamin A deficiency among children under the age of 5. The specific aims of the study were: 1) to quantify the cassava and nutrient intake, and 2) to assess the vitamin A and iron status among preschool children and women of childbearing age. (2015-03-24)
- Published
- 2015
33. Parasitism of Clavigralla spp. (Hemiptera:Coreidae) Eggs by Gryon clavigrallae Mineo (Hymenoptera:Scelionidae)
- Author
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Shanower, T. G.; Crop Protection Division, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, Anitha, V.; Crop Protection Division, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, Bhagwat, V. R.; Crop Protection Division, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, Dreyer, H.; International Institute for Tropical Agriculture (IITA), Plant Health Management Division, B.P. 08-0932, Cotonou, Shanower, T. G.; Crop Protection Division, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, Anitha, V.; Crop Protection Division, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, Bhagwat, V. R.; Crop Protection Division, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, and Dreyer, H.; International Institute for Tropical Agriculture (IITA), Plant Health Management Division, B.P. 08-0932, Cotonou
- Abstract
Clavigralla spp. (Hemiptera: Coreidae) eggs are laid inclusters. Field collections at International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) over three seasons from 1992-93 to 1994-95 showed that cluster size ranges from 2 to 62 eggs with a mean of 17.7 eggs. A majority of egg clusters (72%) contained between 7 and 24 eggs. Gryon clavigrallae Mineo (Hymenoptera: Scelionidae) parasitized up to 69 per cent of eggs and up to 100 per cent of egg clusters each season. Overall, more than 39 per cent of Clavigralla spp. eggs were parasitized by G. clavigrallae. The percentage of egg clusters parasitized and the percentage of eggs parasitized in a cluster were positively correlated with the size of the egg cluster. The percentage of eggs and egg clusters parasitized by G. clavigrallae increased through the season.
- Published
- 2014
34. Cassava Growth And Development In Two Contrasting Environments Of Ibadan And Jos
- Author
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Akparobi, SO; Department of Agronomy, Delta State University, Asaba, Nigeria, Tobih, FO; Department of Agronomy, Delta State University, Asaba, Nigeria, Togun, AO; Department of Crop Protection and Environmental Biology, University of Ibadan, Ibadan, Nigeria, Ekanayake, IJ; IITA (International Institute of Tropical Agriculture), P.M.B. 5320, Ibadan, Nigeria, Oyetunji, SO; Department of Botany and Microbiology, University of Ibadan, Ibadan, Nigeria, Akparobi, SO; Department of Agronomy, Delta State University, Asaba, Nigeria, Tobih, FO; Department of Agronomy, Delta State University, Asaba, Nigeria, Togun, AO; Department of Crop Protection and Environmental Biology, University of Ibadan, Ibadan, Nigeria, Ekanayake, IJ; IITA (International Institute of Tropical Agriculture), P.M.B. 5320, Ibadan, Nigeria, and Oyetunji, SO; Department of Botany and Microbiology, University of Ibadan, Ibadan, Nigeria
- Abstract
Twelve cassava (improved and local) genotypes were grown at two locations in Nigeria (Ibadan and Jos). Leaf area development and dry matter partitioning were studied from 1994 to 1996. Destructive samplings for growth analyses were done at 3, 6, 9 and 12 months after planting (MAP). Genotype, environment and genotype x environment effects were significant for leaf area index (LAI), total dry matter and total dry tuberous root weight. At Ibadan, LAI was 3.6 and 2.1 at 6 and 12 MAP, respectively, while at Jos LAI values of 0.5 and 2.0 were recorded at 6 and 12 MAP, respectively, in the 1994/1995 planting season. Dry matter production and total dry tuberous root weight were significantly less at Jos than at Ibadan. This was attributed to the lower temperature regime and reduced solar radiation levels recorded at Jos plateau. Patterns of dry matter partitioning to the leaves, shoots and roots were similar in both locations. Dry matter partitioning to the roots was controlled by plant age and solar radiation while dry matter partitioning to the leaves was a function of plant age and temperature. These results indicate that dry matter partitioning of cassava to the roots and leaves are dependent upon solar radiation and temperature in higher altitudes. The data may be useful for validation of models of cassava growth being designed for higher altitudes. Agro-Science Vol.2(1) 2001: 67-75
- Published
- 2004
35. Roots and tubers in the global food system
- Author
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Scott, Gregory J.; Best, Rupert; Rosegrant, Mark W.; Mokanga, Mpoko; Centro Internacional de la Papa (CIP); Centro Internacional de Agricultura Tropical (CIAT); International Food Policy Research Insitute (IFPRI); International Institute of Tropical Agriculture (IITA); International Plant Genetic Resources Institute (IPGRI), http://orcid.org/0000-0001-6371-6127 Rosegrant, Mark, Scott, Gregory J.; Best, Rupert; Rosegrant, Mark W.; Mokanga, Mpoko; Centro Internacional de la Papa (CIP); Centro Internacional de Agricultura Tropical (CIAT); International Food Policy Research Insitute (IFPRI); International Institute of Tropical Agriculture (IITA); International Plant Genetic Resources Institute (IPGRI), and http://orcid.org/0000-0001-6371-6127 Rosegrant, Mark
- Abstract
Non-PR, IFPRI5; 2020, DGO, 41 p. : col. ill., tables ; 25 cm.
- Published
- 2000
36. Roots and tubers in the global food system
- Author
-
Scott, Gregory J.; Best, Rupert; Rosegrant, Mark W.; Mokanga, Mpoko; Centro Internacional de la Papa (CIP); Centro Internacional de Agricultura Tropical (CIAT); International Food Policy Research Institute (IFPRI); International Institute of Tropical Agriculture (IITA), http://orcid.org/0000-0001-6371-6127 Rosegrant, Mark, Scott, Gregory J.; Best, Rupert; Rosegrant, Mark W.; Mokanga, Mpoko; Centro Internacional de la Papa (CIP); Centro Internacional de Agricultura Tropical (CIAT); International Food Policy Research Institute (IFPRI); International Institute of Tropical Agriculture (IITA), and http://orcid.org/0000-0001-6371-6127 Rosegrant, Mark
- Abstract
Non-PR, IFPRI2; 2020, DGO
- Published
- 2000
37. Roots and tubers in the global food system
- Author
-
Scott, Gregory J.; Best, Rupert; Rosegrant, Mark W.; Mokanga, Mpoko; Centro Internacional de la Papa (CIP); Centro Internacional de Agricultura Tropical (CIAT); International Food Policy Research Institute (IFPRI); International Institute of Tropical Agriculture (IITA); International Plant Genetic Resources Institute (IPGRI), http://orcid.org/0000-0001-6371-6127 Rosegrant, Mark, Scott, Gregory J.; Best, Rupert; Rosegrant, Mark W.; Mokanga, Mpoko; Centro Internacional de la Papa (CIP); Centro Internacional de Agricultura Tropical (CIAT); International Food Policy Research Institute (IFPRI); International Institute of Tropical Agriculture (IITA); International Plant Genetic Resources Institute (IPGRI), and http://orcid.org/0000-0001-6371-6127 Rosegrant, Mark
- Abstract
Non-PR, IFPRI2; 2020, DGO
- Published
- 2000
38. Towards an efficient and risk aware strategy for guiding farmers in identifying best crop management
- Author
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Gautron, Romain, Baudry, Dorian, Adam, Myriam, Falconnier, Gatien N, Corbeels, Marc, International Center for Tropical Agriculture [Colombie] (CIAT), Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Agroécologie et Intensification Durables des cultures annuelles (UPR AIDA), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST), Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Amélioration génétique et adaptation des plantes méditerranéennes et tropicales (UMR AGAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM), Institut de l'Environnement et Recherches Agricoles [Ouagadougou] (INERA), Centre national de la recherche scientifique et technologique [Ouagadougou] (CNRST), Département Systèmes Biologiques (Cirad-BIOS), International Maize and Wheat Improvement Center [Zimbabwe] (CIMMYT), International Maize and Wheat Improvement Center (CIMMYT), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), International Institute of Tropical Agriculture (IITA Kenya), and International Institute of Tropical Agriculture [Nigeria] (IITA)
- Subjects
FOS: Computer and information sciences ,ACM: I.: Computing Methodologies/I.2: ARTIFICIAL INTELLIGENCE ,Artificial Intelligence (cs.AI) ,Computer Science - Artificial Intelligence ,[SDV.SA.AGRO]Life Sciences [q-bio]/Agricultural sciences/Agronomy ,[INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI] - Abstract
Identification of best performing fertilizer practices among a set of contrasting practices with field trials is challenging as crop losses are costly for farmers. To identify best management practices, an ''intuitive strategy'' would be to set multi-year field trials with equal proportion of each practice to test. Our objective was to provide an identification strategy using a bandit algorithm that was better at minimizing farmers' losses occurring during the identification, compared with the ''intuitive strategy''. We used a modification of the Decision Support Systems for Agro-Technological Transfer (DSSAT) crop model to mimic field trial responses, with a case-study in Southern Mali. We compared fertilizer practices using a risk-aware measure, the Conditional Value-at-Risk (CVaR), and a novel agronomic metric, the Yield Excess (YE). YE accounts for both grain yield and agronomic nitrogen use efficiency. The bandit-algorithm performed better than the intuitive strategy: it increased, in most cases, farmers' protection against worst outcomes. This study is a methodological step which opens up new horizons for risk-aware ensemble identification of the performance of contrasting crop management practices in real conditions.
- Published
- 2022
39. Reconciling yield gains in agronomic trials with returns under African smallholder conditions
- Author
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Moses Thuita, Karen Macours, Cargele Masso, Rachid Laajaj, Bernard Vanlauwe, Universidad de los Andes [Bogota] (UNIANDES), Paris School of Economics (PSE), École des Ponts ParisTech (ENPC)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris 1 Panthéon-Sorbonne (UP1)-Centre National de la Recherche Scientifique (CNRS)-École des hautes études en sciences sociales (EHESS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Paris Jourdan Sciences Economiques (PJSE), Université Paris 1 Panthéon-Sorbonne (UP1)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École des hautes études en sciences sociales (EHESS)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), International Institute of Tropical Agriculture (IITA-DRC), International Institute of Tropical Agriculture [Nigeria] (IITA), and Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR)
- Subjects
0301 basic medicine ,Emerging technologies ,Yield (finance) ,Developing country ,lcsh:Medicine ,Zea mays ,Article ,03 medical and health sciences ,Agricultural science ,0302 clinical medicine ,Economics ,Humans ,lcsh:Science ,Developing Countries ,Selection (genetic algorithm) ,Yield gain ,2. Zero hunger ,Farmers ,Multidisciplinary ,Poverty ,business.industry ,Research ,lcsh:R ,1. No poverty ,[SHS.ECO]Humanities and Social Sciences/Economics and Finance ,Kenya ,Crop Production ,Environmental social sciences ,030104 developmental biology ,Agriculture ,Scale (social sciences) ,lcsh:Q ,Soybeans ,business ,Agroecology ,030217 neurology & neurosurgery - Abstract
Increased adoption of improved agricultural technologies is considered an essential step to address global poverty and hunger, and agronomic trials suggest intensification in developing countries could result in large yield gains. Yet the promise of new technologies does not always carry over from trials to real-life conditions, and diffusion of many technologies remains limited. We show how parcel and farmer selection, together with behavioural responses in agronomic trials, can explain why yield gain estimates from trials may differ from the yield gains of smallholders using the same inputs under real-life conditions. We provide quantitative evidence by exploiting variation in farmer selection and detailed data collection from research trials in Western Kenya on which large yield increments were observed from improved input packages for maize and soybean. After adjusting for selection, behavioural responses, and other corrections, estimates of yield gains fall to being not significantly different from zero for the input package tested on one of the crops (soybean), but remain high for the other (maize). These results suggest that testing new agricultural technologies in real-world conditions and without researcher interference early in the agricultural research and development process might help with identifying which innovations are more likely to be taken up at scale.
- Published
- 2020
40. Re-assessing the pest status of Tetranychus evansi (Acari: Tetranychidae) on solanaceous crops and farmers control practices in Benin
- Author
-
Azandeme-Hounmalon, Ginette, Sikirou, Rachidatou, Onzo, Alexis, Fiaboe, Komi, Tamo, Manuele, Kreiter, Serge, Martin, Thibaud, Université Nationale d’Agriculture (UNA), Institut National des Recherches Agricoles du Bénin (INRAB), Université de Parakou (UP), International Institute of Tropical Agriculture (IITA-Cameroon), International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), International Institute of Tropical Agriculture (IITA-Benin), Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM), Fonctionnement agroécologique et performances des systèmes de cultures horticoles (UPR HORTSYS), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST), and This work was supported by the Institut National des Recherches Agricoles du Bénin (INRAB) through the project 'Programme National de la Recherche Agricole' (PNRA) and International Institute of Tropical Agriculture of Benin (IITA-Benin).
- Subjects
Ravageur des plantes ,Enquête organismes nuisibles ,Predatory mites ,[SDV]Life Sciences [q-bio] ,Solanaceous crops ,Chemical pesticide ,Tetranychids ,Agricultural and Biological Sciences (miscellaneous) ,H10 - Ravageurs des plantes ,Pesticide ,Acarien prédateur ,Benin ,Tetranychus ,Agronomy and Crop Science ,Solanaceae ,Food Science - Abstract
International audience; Highlights• Importance of re-assessment of Tetranychus evansi status.• Importance of T. evansi damage on Tomato, African eggplant and pepper.• Importance of heavy chemical doses application.• Local predatory mites.AbstractThis study was carried out 7 years after a first one conducted in 2013 as part of the policy of the Benin government to promote the vegetable production sector. Data collection was mostly based on a countrywide survey conducted in 25 municipalities throughout Benin, from August to December 2020. Farmers were selected based on their experience in cultivating solanaceous crops, and were interviewed to assess their perception about the severity of the spider mite Tetranychus evansi, the control method they used against this pest, and their knowledge about potential predators associated with the mites. Additionally, predatory mites associated with T. evansi in farmer fields were identified. All farmers recognized T. evansi to which they attributed local names depending on their ethnic group. They were also able to identify its damages on solanaceous crops. They indicated that outbreaks of T. evansi occurs at the end of the rainy season while their damages are more severe during the dry season. Production losses due to the mites were estimated by farmers to 27%, 24% and 22% respectively for tomato, African eggplant, pepper in the moderate damage case and 80%, 79%, 55% respectively for tomato, African eggplant and pepper in the severe damage conditions. To fight the mites, farmers generally apply heavy doses of chemical pesticides at high frequency. Pyrethroid and organophosphate compounds are the most frequently used pesticides. The only phytophagous mite recorded was T. evansi. A total of four species of predatory mites, all belonging to the phytoseiid family, were found associated with the pest on Solanaceous plants: Amblyseius swirskii, A. tamatavensis, Neoseiulus barkeri and N. longispinosus. This is the first report of the presence of N. longispinosus in Benin. Considering the high losses attributed to the pest, effective and sustainable management practices are necessary.
- Published
- 2022
41. Progeny fitness determines the performance of the parasitoid Therophilus javanus, a prospective biocontrol agent against the legume pod borer
- Author
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Barry R. Pittendrigh, Ramasamy Srinivasan, Manuele Tamò, Aimé H. Bokonon-Ganta, Djibril Aboubakar Souna, Mesmin Alizannon, Anne-Nathalie Volkoff, Marc Ravallec, International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Université d’Abomey-Calavi (UAC), Diversité, Génomes & Interactions Microorganismes - Insectes [Montpellier] (DGIMI), Université de Montpellier (UM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), World Vegetable Center, Michigan State University [East Lansing], Michigan State University System, International Institute of Tropical Agriculture (IITA-Benin), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Cooperation and Cultural Action Service (SCAC) of the French Embassy in Cotonou N 898392E, CGIAR, and Bill & Melinda Gates Foundation OPP1082463
- Subjects
Male ,0106 biological sciences ,Behavioural ecology ,Ecophysiology ,Science ,[SDV]Life Sciences [q-bio] ,Wasps ,Biological pest control ,Moths ,010603 evolutionary biology ,01 natural sciences ,Article ,Parasitoid ,Toxicology ,Animals ,Population dynamics ,Pest Control, Biological ,Larva ,Multidisciplinary ,biology ,Host (biology) ,Reproduction ,fungi ,biology.organism_classification ,010602 entomology ,Maruca vitrata ,Medicine ,Instar ,Female ,Agroecology ,Sex ratio - Abstract
Therophilus javanus (Bhat & Gupta) is an exotic larval endoparasitoid newly imported from Asia into Africa as a classical biological control agent against the pod borer Maruca vitrata (Fabricius). The parasitoid preference for the five larval instars of M. vitrata and their influence on progeny sex ratio were assessed together with the impact of larval host age at the time of oviposition on development time, mother longevity and offspring production. In a choice situation, female parasitoids preferred to oviposit in the first three larval instars. The development of immature stages of the parasitoid was observed inside three-day-old hosts, whereby the first two larval instars of T. javanus completed their development as endoparasites and the third larval instar as ectoparasite. The development time was faster when first larval instars (two- and three-day-old) of the host caterpillars were parasitized compared to second larval instar (four-day-old). The highest proportion of daughters (0.51) was observed when females were provided with four-day-old hosts. The lowest intrinsic rate of increase (r) (0.21 ± 0.01), the lowest rate of increase (λ) (1.23 ± 0.01), and the lowest net reproductive rate (Ro) (35.93 ± 6.51) were recorded on four-day-old hosts. These results are discussed in the light of optimizing mass rearing and release strategies.
- Published
- 2021
42. Secondary metabolite effects of different cocoa genotypes on feeding preference of the mirid Sahlbergella singularis Hagl
- Author
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R. Dibanda Feumba, I. Mama Ngah, C.F. Bilong Bilong, P. B. Nsoga Etam, Raymond Joseph Mahob, Hermine Claudine Mahot, D. M. Taliedje, F. Edoun Ebouel, Rachid Hanna, Régis Babin, C. B. Bakwo Bassogog, Université de Yaoundé I, Institut de Recherche Agricole pour le Développement [Yaoundé] (IRAD), University of Buéa, Institut de Recherches Médicales et d'Etudes des Plantes Médicinales (IMPM), International Institute of Tropical Agriculture (IITA-Cameroon), International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), University of California [Los Angeles] (UCLA), University of California, Plant Health Institute of Montpellier (UMR PHIM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and public investment funds of Cameroon
- Subjects
0106 biological sciences ,F60 - Physiologie et biochimie végétale ,%22">Major ,Secondary metabolite ,Biology ,01 natural sciences ,Toxicology ,Feeding behavior ,Attractiveness/antixenosis ,Genotype ,Plant defense against herbivory ,medicine ,Sahlbergella singularis ,Theobroma cacao ,Ecology, Evolution, Behavior and Systematics ,2. Zero hunger ,Herbivore ,Ecology ,food and beverages ,Plant secondary metabolites ,H10 - Ravageurs des plantes ,[SDV.BV.PEP]Life Sciences [q-bio]/Vegetal Biology/Phytopathology and phytopharmacy ,010602 entomology ,Biochemical analyses ,Tolerantresistant varieties ,Insect Science ,Insect-plant interactions ,Résistance aux organismes nuisibles ,PEST analysis ,Sahlbergella ,Agronomy and Crop Science ,010606 plant biology & botany ,medicine.drug - Abstract
International audience; Sahlbergella singularis is a major insect pest of cocoa in Cameroon. Conventional insecticides remain the most widely used option for mirid control, which unfortunately have adverse effects on the environment and human health. Improved methods of controlling this species, both environmentally friendly and inexpensive to farmers, are requirements. Varietal control based on the selection of resistant and/or tolerant genotypes can be an interesting approach. Nonetheless, the role of secondary metabolites (SMs) in cocoa defense against mirids is poorly documented; yet, these compounds are reported to be key elements in plant defense against herbivores. For this purpose, SMs of twelve cocoa genotypes were identified and quantified, as well as their impact on food preference by mirids. Food preference was assessed through microtests measuring cocoa attractiveness and antixenosis toward mirids. The results showed that cocoa genotypes were differently accepted as food by mirids, with a significant preference for hybrid IMC60 x SNK605 and a non-preference for T60/887. The ten other cocoa genotypes showed intermediate results. Five SMs classes: alkaloids, flavonoids, polyphenols, saponins, and tannins were identified. Their rates varied between cocoa genotypes: polyphenols > alkaloids > flavonoids > tannins, and saponins. Cocoa genotypes with high total phenolic contents were significantly preferred by S. singularis (r(alpha) = 0.86, R-2 = 74.0%, P < 0.001), while those with low saponins contents were lowly accepted (r(alpha) = - 0.83, R-2 = 68.9%, P < 0.015), independently of the levels of other SMs. Given SMs high potential to affect mirid feeding behavior, analyzing cocoa SMs composition may help in early selection of resistant cocoa varieties against S. singularis.
- Published
- 2021
43. Biocontrol of the Brown Cocoa Mirids Using Neem Oil and an Ethanolic Extract from Neem under Laboratory Conditions
- Author
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S. Eteme Enama, Raymond Joseph Mahob, Christian Cilas, C.F. Bilong Bilong, D. M. Taliedje, I. Mama Ngah, Hermine Claudine Mahot, Y.G. Fotso Toguem, Rachid Hanna, University of Yaoundé [Cameroun], Laboratory of Parasitology and Ecology, Faculty of Science, University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon, Université de Yaoundé I, Institute of Agricultural Research for Development (IRAD), Institut de Recherche Agricole pour le Développement [Yaoundé] (IRAD), International Institute of Tropical Agriculture (IITA-Cameroon), International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Agrosystèmes Biodiversifiés (UMR ABSys), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre International de Hautes Etudes Agronomiques Méditerranéennes - Institut Agronomique Méditerranéen de Montpellier (CIHEAM-IAMM), Centre International de Hautes Études Agronomiques Méditerranéennes (CIHEAM)-Centre International de Hautes Études Agronomiques Méditerranéennes (CIHEAM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Direction Générale Déléguée à la Recherche et à la Stratégie (Cirad-Dgdrs), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), and This study was funded by the special research allowances from the Ministry of Higher Education and internal allowances from the University of Yaounde I. Thanks to the Institute of Agricultural Research for Development and the International Institute of Tropical Agriculture for logistic and laboratory products.
- Subjects
0106 biological sciences ,Insecticide d'origine végétale ,insecticide biologique ,[SDV]Life Sciences [q-bio] ,Sahlbergella singularis ,Biological pest control ,H02 - Pesticides ,Gestion intégrée des ravageurs ,Biology ,01 natural sciences ,Toxicology ,Ingestion ,Theobroma cacao ,Huile de neem ,Ecology, Evolution, Behavior and Systematics ,Neem oil ,Azadirachta indica ,High mortality ,cocoa agroforestry systems ,Pesticide ,H10 - Ravageurs des plantes ,biopesticide ,integrated pest management (IPM) ,010602 entomology ,Biopesticide ,Insect Science ,PEST analysis ,Lutte biologique contre les ravageurs ,Agronomy and Crop Science ,Insecte nuisible ,010606 plant biology & botany - Abstract
International audience; The African mirid bug (Sahlbergella singularis) is the most economically important insect pest in cocoa farms. Pesticide management, although controversial due to the adverse effects of these substances on the environment and on human health, remains the main option used for controlling this pest. In the recent decades, the development of alternative approaches to synthetic pesticides is a requirement. Therefore, we used neem oil (NO) and ethanolic extracts (EE) from leaves at different concentrations to evaluate, in vitro, their insecticidal potentials against mirids. Mirid mortality increased significantly with increase in concentrations, values ranged from 32.5 to 92.5% for EE and 52.5 to 97.5% forNO. Apart from negative controls, Tween 80 and distilled water, that showed significant low mortality rates, both extracts revealed effectiveness comparable to the reference insecticide used in controlling mirids, except for EE by ingestion. Mirids treated by contact showed significantly high mortality rates (72.5 to 97.5 %) compared to those treated by ingestion (32.5 to 70.0 %). The greatest biological effectiveness values were obtained at a concentration of 8 % by contact exposure: 0.88 ml/ml (NO) and 0.73 g/ml (EE) for LC50 and =1 day to both extracts for LT50. Given effectiveness comparable to that of the insecticide, both tested extracts should be considered as effective biopesticides for IPM against mirids, especially S. singularis.
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- 2021
44. New insights into the diversity, taxonomy and history of the fern genus Trichomanes (Hymenophyllaceae, Polypodiidae), with a focus on Africa and the western Indian Ocean
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Vincent Droissart, Samuli Lehtonen, Alexandre Salino, Hanna Tuomisto, Timothée Le Péchon, Jean-Yves Dubuisson, Atsushi Ebihara, Sabine Hennequin, Germinal Rouhan, Vincent Deblauwe, Institut de Systématique, Evolution, Biodiversité (ISYEB ), Muséum national d'Histoire naturelle (MNHN)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), Botanic Garden Meise, Université libre de Bruxelles (ULB), International Institute of Tropical Agriculture (IITA-Cameroon), International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), University of California [Los Angeles] (UCLA), University of California, Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and University of Turku
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0106 biological sciences ,0303 health sciences ,biology ,Ecology ,media_common.quotation_subject ,[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE] ,Plant Science ,biology.organism_classification ,Hymenophyllaceae ,[SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy ,010603 evolutionary biology ,01 natural sciences ,03 medical and health sciences ,Indian ocean ,Genus ,Trichomanes ,Taxonomy (biology) ,14. Life underwater ,Fern ,Ecology, Evolution, Behavior and Systematics ,Polypodiidae ,030304 developmental biology ,Diversity (politics) ,media_common - Abstract
The filmy fern genus Trichomanes mainly comprises Neotropical species and a few taxa in Africa and the western Indian Ocean. The aim of this study is to infer the phylogenetic placement of all five Afro-Malagasy taxa in the genus and to investigate their history via an expanded and dated phylogenetic analysis including 39 species representing over half the diversity of the genus. The results support the monophyly of Trichomanes including all the sampled species attributed to the genus, but also suggest the inclusion of the species Abrodictyum cellulosum, revealing a morphological diversity of the genus greater than what was traditionally recognized, and highlighting the importance of the campanulate sorus as a generic diagnostic character. To accommodate those new phylogenetic results and morphological investigations, we describe a new subgenus Afrotrichomanes grouping the Afro-Malagasy taxa (except T. crenatum). The dated history of the genus among the trichomanoids suggests at least two origins for the Palaeotropical species. A recent Cainozoic colonization from the Neotropics towards Africa gave rise to the West African taxon T. crenatum, and a possible Mesozoic vicariance event gave rise to subgenus Afrotrichomanes. The low species diversity of the genus in the Afro-Malagasy region is discussed.
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- 2021
45. Des analyses protéotrancriptomiques révèlent une grande expansion des protéines de type métalloprotéase dans les vésicules atypiques de venin de la guêpe parasitoide Meteorus pulchricornis (Braconidae)
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Gatti, Jean-Luc, Belghazi, Maya, Legeai, Fabrice, Ravallec, Marc, Frayssinet, Marie, Robin, Stéphanie, Aboubakar-Souna, Djibril, Srinivasan, Ramasamy, Tamò, Manuele, Poirié, Marylène, Volkoff, Anne-Nathalie, Institut Sophia Agrobiotech (ISA), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Côte d'Azur (UCA), Institut de neurophysiopathologie (INP), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Institut de Génétique, Environnement et Protection des Plantes (IGEPP), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Scalable, Optimized and Parallel Algorithms for Genomics (GenScale), Inria Rennes – Bretagne Atlantique, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-GESTION DES DONNÉES ET DE LA CONNAISSANCE (IRISA-D7), Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Rennes 1 (UR1), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Diversité, Génomes & Interactions Microorganismes - Insectes [Montpellier] (DGIMI), Université de Montpellier (UM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), World Vegetable Center (WorldVeg), International Institute of Tropical Agriculture (IITA-Benin), International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Department of Plant Health (SPE) from the French National Institute for Research in Agriculture, Food and Environment (INRAE) and from the French Government, ANR-12-ADAP-0001,ABC - PaPoGen,Adaptation en lutte biologique - Génomique des populations de parasitoïdes(2012), ANR-11-LABX-0028,SIGNALIFE,Réseau d'Innovation sur les Voies de Signalisation en Sciences de la Vie(2011), ANR-15-IDEX-0001,UCA JEDI,Idex UCA JEDI(2015), Université Nice Sophia Antipolis (1965 - 2019) (UNS), Université de Rennes (UR)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-INSTITUT AGRO Agrocampus Ouest, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique)
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Meteorus pulchricornis ,venomics ,DUF-4803 proteins ,Braconidae ,[SDV]Life Sciences [q-bio] ,virus-like particles (VLPs) ,transcriptomic ,metalloproteases ,parasitoid wasp ,complex mixtures ,proteomic - Abstract
International audience; Meteorus pulchricornis (Ichneumonoidea, Braconidae) is an endoparasitoid wasp of lepidopteran caterpillars. Its parasitic success relies on vesicles (named M. pulchricornis Virus-Like Particles or MpVLPs) that are synthesized in the venom gland and injected into the parasitoid host along with the venom during oviposition. In order to define the content and understand the biogenesis of these atypical vesicles, we performed a transcriptome analysis of the venom gland and a proteomic analysis of the venom and purified MpVLPs. About half of the MpVLPs and soluble venom proteins identified were unknown and no similarity with any known viral sequence was found. However, MpVLPs contained a large number of proteins labelled as metalloproteinases while the most abundant protein family in the soluble venom was that of proteins containing the Domain of Unknown Function DUF-4803. The high number of these proteins identified suggests that a large expansion of these two protein families occurred in M. pulchricornis. Therefore, although the exact mechanism of MpVLPs formation remains to be elucidated, these vesicles appear to be “metalloproteinase bombs” that may have several physiological roles in the host including modifying the functions of its immune cells. The role of DUF4803 proteins, also present in the venom of other braconids, remains to be clarified.
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- 2021
46. Push-pull strategy combined with net houses for controlling cowpea insect pests and enhancing crop yields
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Lucy Kananu Murungi, Komi K. M. Fiaboe, John Munji Kimani, Seydou Diabate, Thibaud Martin, Emilie Deletre, John Wesonga, International Centre of Insect Physiology and Ecology (ICIPE), ICIPE, Jomo Kenyatta University of Agriculture and Technology (JKUAT), Fonctionnement agroécologique et performances des systèmes de cultures horticoles (UPR HORTSYS), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Université de Montpellier (UM), International Institute of Tropical Agriculture (IITA-Cameroon), International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), and Kenya Agricultural & Livestock Research Organization (KALRO)
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2. Zero hunger ,0106 biological sciences ,Integrated pest management ,Empoasca ,biology ,Crop yield ,[SDV]Life Sciences [q-bio] ,Trialeurodes ,15. Life on land ,biology.organism_classification ,01 natural sciences ,Toxicology ,010602 entomology ,Maruca vitrata ,13. Climate action ,Dry season ,Push–pull strategy ,Aphis craccivora ,Agronomy and Crop Science ,010606 plant biology & botany - Abstract
Net houses can be used in tropical environments to protect crops such as cowpea against large insect pests, thereby avoiding pesticide treatments while sustainably mitigating the effects of climate change. We investigated a push-pull strategy to prevent small insect pest outbreaks in a net house. The push component consisted of two stimulus plants, i.e. Cymbopogon citratus and Tagetes minuta, and the pull stimuli consisted of visual cues from blue and yellow sticky traps. Field experiments were set up in central Kenya and conducted during a rainy and a dry season, involving an open field control treatment, and three management treatments consisting of (1) an open field push-pull treatment, (2) a net house treatment and (3) a combined net house + push-pull treatment. Trialeurodes vaporariorum infestations were lower in the net house and net house + push-pull treatments than in the two open field treatments during the dry period or in the control treatment during the rainy period. Aphis craccivora infestations were higher in the net house and net house + push-pull treatments than in the control and open field push-pull treatments during the dry period, while no differences were observed among treatments during the rainy period. Megalurothrips sjostedti infestations did not vary among treatments in both periods. Among the larger insect pests, Clavigralla tomentosicollis infestations were lower in the net house and net house + push-pull treatments than in the open field treatments during the dry period, while Maruca vitrata infestations were lower in the net house treatment than in the control. During the rainy period, C. tomentosicollis infestations were higher in the net house + push-pull treatment than in the net house treatment, whereas M. vitrata infestations did not vary among treatments. Compared to the control, Empoasca sp. infestations were lower in the net house and net house + push-pull treatments in both periods, and in the open field push-pull treatment in the rainy period. Cowpea pod and grain yield and quality were higher in the net house and net house + push-pull treatments than in the control irrespective of the period. Although the treatments 1 reduced some of the pests, the net house and net house + push-pull treatments were effective in protecting cowpeas against most of the pests while improving pod yields in both periods.
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- 2021
47. PICT: A low cost, modular, open‐source camera trap system to study plant‐insect interactions
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Droissart, Vincent, AZANDI, LAURA, Onguene, Eric Rostand, Savignac, Marie, Smith, Thomas, Deblauwe, Vincent, Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université libre de Bruxelles (ULB), University of Yaoundé [Cameroun], International Institute of Tropical Agriculture (IITA-Cameroon), International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Center for Tropical Research (|os Angeles] (CTR), University of California [Los Angeles] (UCLA), University of California (UC)-University of California (UC), and University of California-University of California
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[SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems ,Behavioural ecology ,Pollination biology ,Raspberry Pi ,Low‐cost technology ,E‐ecology ,[SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology ,Digital video recording ,Plant‐insect interaction ,[SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy ,DIY camera trap - Abstract
International audience; 1. Commercial camera traps (CTs) commonly used in wildlife studies have several technical limitations that restrict their scope of application. They are not easily customizable, unit prices sharply increase with image quality, and importantly, they are not designed to record the activity of ectotherms such as insects. Those developed for the study of plant-insect interactions are yet to be widely adopted as they rely on expensive and heavy equipment. 2. We developed PICT (Plant-insect Interactions Camera Trap), an inexpensive (720p resolution with a 110 Wh power bank (30,000 mAh). Its ultra-portable (
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- 2021
48. Filling the gaps in gene banks: Collecting, characterizing, and phenotyping wild banana relatives of Papua New Guinea
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Catherine Breton, Julie Sardos, Janet Paofa, Simon Kallow, Claude Welcker, Bart Panis, David Eyland, Steven Janssens, François Tardieu, Sebastien Carpentier, Rony Swennen, Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Bioversity International [Montpellier], Bioversity International [Rome], Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Royal Botanic Gardens [Kew], Bioversity International [Belgique], International Institute of Tropical Agriculture (IITA-Tanzania), International Institute of Tropical Agriculture [Nigeria] (IITA), PNG National Agricultural Research Institute (NARI), Écophysiologie des Plantes sous Stress environnementaux (LEPSE), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Meise Botanic Garden [Belgium] (Plantentuin), 'Adapting Agriculture to Climate Change: Collecting, Pro-tecting and Preparing Crop Wild Relatives,' which is supported by the Government of Norway., Global Crop Diversity Trust in part-nership with national and international gene banks and plant breeding institutes around the world (http://www.cwrdiversity.org/)., The Deutsche Gesellschaft für Interna-tionale Zusammenarbiet GIZ, scholarship funded by the Global TRUST foundation project 'Crop wild Relatives Evaluation of drought tolerance in wild bananas from Papua New Guinea', CGIAR Fund (https://www.cgiar.org/funders/), CGIAR Research Program Roots, Tubers and Bananas (RTB-CRP), Belgian Development Cooperation project ‘‘More fruit for food security: Developing climate-smart bananas for the African Great Lakes region.', European Project: 731013 ,EPPN2020(2017), Royal Botanic Gardens, Kew, Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and Botanic Garden Meise
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2. Zero hunger ,0106 biological sciences ,0303 health sciences ,[SDV.GEN]Life Sciences [q-bio]/Genetics ,Vapour Pressure Deficit ,business.industry ,Drought tolerance ,Plant genetics ,15. Life on land ,Biology ,biology.organism_classification ,01 natural sciences ,Musa peekelii ,Crop ,03 medical and health sciences ,Horticulture ,Gene bank ,Agriculture ,Shoot ,business ,Agronomy and Crop Science ,030304 developmental biology ,010606 plant biology & botany - Abstract
International audience; Since natural habitats are disappearing fast, there is an urgent need to collect, characterize, and phenotype banana (Musa spp.) crop wild relatives to identify unique genotypes with specific traits that fill the gaps in our gene banks. We report on a collection mission in Papua New Guinea carried out in 2019. Seed containing bunches were collected from Musa peekelii ssp. angustigemma (N.W.Simmonds) Argent (3), M. schizocarpa N. W. Simmonds (4), M. balbisiana Colla (3), M. acuminata ssp. banksii (F. Muell.) Simmonds (14), M. boman Argent (3), M. ingens Simmonds (2), M. maclayi ssp. maclayi F.Muell. ex Mikl.-Maclay (1), and M. lolodensis Cheesman (1). This material, together with the seeds collected during a previous mission in 2017, form the basis for the development of a wild banana seed bank. For characterization and phenotyping, we focused on the most ubiquitous indigenous species of Papua New Guinea: M. acuminata ssp. banksii, the ancestor of most edible bananas. We calculated that the median genomic dissimilarity of the M. acuminata ssp. banksii accessions was 4% and that they differed at least 5% from accessions present in the International Transit Centre, the world's largest banana gene bank. High-throughput phenotyping revealed drought avoidance strategies with significant differences in root/shoot ratio, soil water content sensitivity, and response towards vapor pressure deficit (VPD). We deliver a proof of principle that the wild diversity is not yet fully covered in the gene banks and that wild M. acuminata ssp. banksii populations contain individuals with unique traits, useful for drought tolerance breeding programs.
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- 2021
49. Impacts on greenhouse gas balance and rural economy after agroecology development in Itasy Madagascar
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Alain Albrecht, Mamonjiniaina Andriamirajo Ramarofidy, Tantely M. Razafimbelo, Sylvain Deffontaines, Tiphaine Chevallier, Cargele Masso, Adrien Lepage, Syndhia Mathé, Lydie Chapuis-Lardy, Narindra H. Rakotovao, Tsifera Henintsoa Rakotoniamonjy, Laboratoire des Radio-Isotopes (LRI), Université d'Antananarivo, Université d'Antananarivo, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), LMI IESOL Intensification Ecologique des Sols Cultivés en Afrique de l’Ouest [Dakar] (IESOL), Institut de recherche pour le développement (IRD [Sénégal]), Agrisud International [Madagascar], Agrisud International, Innovation et Développement dans l'Agriculture et l'Alimentation (UMR Innovation), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), International Institute of Tropical Agriculture (IITA-Cameroon), International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Département Environnements et Sociétés (Cirad-ES), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), BNP Paribas through SoCa’s project 'Soil carbon for tropical subsistence farming'., Mahavotra project (2001–2016) 'Agroecology and forestry in Itasy Region, Madagascar', funded by the Agence Française de Développement (AFD), Aquitaine Region (France), and International Foundation for Science Grant N° I-1-D-5594-2
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[SDV.SA]Life Sciences [q-bio]/Agricultural sciences ,Économie rurale ,F08 - Systèmes et modes de culture ,Strategy and Management ,agroécologie ,02 engineering and technology ,Agroforesterie ,System of Rice Intensification ,Industrial and Manufacturing Engineering ,Agricultural economics ,Sustainable agriculture ,Agriculture durable ,0202 electrical engineering, electronic engineering, information engineering ,General Environmental Science ,2. Zero hunger ,[SDV.EE]Life Sciences [q-bio]/Ecology, environment ,05 social sciences ,1. No poverty ,Compost ,Profitability index ,Gaz à effet de serre ,System of rice intensification ,020209 energy ,12. Responsible consumption ,systèmes agroforestiers ,impacts socio-économiques ,Agroforestry ,Agroecology ,Productivity ,E10 - Économie et politique agricoles ,0505 law ,Renewable Energy, Sustainability and the Environment ,business.industry ,Impact sur l'environnement ,Emission Sink ,Analyse économique ,15. Life on land ,Carbon footprint ,Climate change mitigation ,13. Climate action ,Agriculture ,Greenhouse gas ,050501 criminology ,business - Abstract
International audience; Rural development projects to develop sustainable agriculture need to be assessed before engaging smallholder farmers at large scale. Data on agricultural systems to produce food, provide income for smallholders and reduce greenhouse-gas (GHG) emissions are scarce in Sub-Saharan Africa countries. Here, we assessed the potential of agroecological practices (AP) on economic benefits to farmers, GHG balance derived from agricultural activities, and efficiency of economic investments to mitigate GHG. The study was based on a NGO rural development project, which promoted AP: agroforestry, compost, and System of Rice Intensification. The economic and GHG mitigation benefits were projected over a period of 20 years on three scenarios. Two scenarios, differing by two expected levels of AP adoption, were compared to a reference one, in which there was no NGO intervention. Socio-economic, yield and soil data were gathered on 192 farms during five growing seasons (2013–2018). The GHG balance was estimated with TropiC Farm Tool and EX-ACT. The GHG emissions were reduced in both scenarios compared to the reference one: −5.2 to −13.6 tCO2eq farm−1 yr−1 for scenario 1 and 2 respectively. At the regional scale, the projected amount of C saved per euro invested was estimated at −0.25 tCO2eq euro−1 and -0.41 tCO2eq Euro−1 (or € 4 to 2.5 tCO2eq−1) under scenario 1 and scenario 2. The annual cash flow of farmers increased over the 20 years. Our study highlighted the potential of AP for increasing productivity and profitability of smallholder agricultural systems for the Malagasy farmers, while simultaneously contributing to climate change mitigation.
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- 2021
50. Cocoa marketing chain in developing countries: How do formal-informal linkages ensure its sustainability in Cameroon?
- Author
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Armel Awah Manga, Maria Geitzenauer, Dorothy Engwali Fon, Lionel Lenou Nkouedjo, Syndhia Mathé, International Institute of Tropical Agriculture (IITA-Cameroon), International Institute of Tropical Agriculture [Nigeria] (IITA), Consultative Group on International Agricultural Research [CGIAR] (CGIAR)-Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Innovation et Développement dans l'Agriculture et l'Alimentation (UMR Innovation), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), University of Dschang, Chercheur indépendant, University of Yaoundé [Cameroun], Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Département Environnements et Sociétés (Cirad-ES), and Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)
- Subjects
Sociology and Political Science ,E70 - Commerce, commercialisation et distribution ,Developing country ,Qualitative property ,produits de cacao ,[SHS]Humanities and Social Sciences ,Competition (economics) ,Intermediary ,Cocoa ,secteur agro-alimentaire ,0502 economics and business ,Theobroma cacao ,Marketing margin ,050207 economics ,Marketing ,Pays en développement ,Durabilité ,E10 - Économie et politique agricoles ,E21 - Agro-industrie ,Coût de distribution ,Descriptive statistics ,Liberalization ,05 social sciences ,Marketing cost ,Chain (unit) ,Sustainability ,Market intermediaries ,Business ,Circuit de commercialisation ,Marketing channel ,Marge de distribution ,050203 business & management - Abstract
International audience; Although liberalization of the cocoa sector has increased internal competition within the marketing chain it has also led to the emergence of informal market actors within the chain. Therefore, the aim of this paper is to analyse how the cocoa marketing chain operates by measuring and comparing the marketing margins of the formal and informal actors. Qualitative data were used to establish the structure of the marketing chain and quantitative data to estimate the marketing margins. A total sampling size of 76 cocoa market actors was obtained by using a multi-stage sampling technique: 15 for qualitative data and 61 for quantitative data. Descriptive analysis was used to map the marketing chain and economic analysis to compute the costs and margins for both informal and formal market intermediaries from the Centre and South-West regions in Cameroon. The results indicated three market intermediaries (one informal and two formal) and four marketing channels by which cocoa moves from the farmers to the exporters. The calculation of marketing costs indicated that informal actors incurred the highest costs in both regions. The results regarding the marketing margins were twofold: informal actors obtain low net marketing margins when they do not use illicit strategies, but high net marketing margins when illicit strategies are used. Given the significant role of informal actors, we suggest that their actions should be integrated in a suitable manner into those of formal actors to contribute to a better performance of the marketing chain and to the sustainability of the cocoa sector.
- Published
- 2020
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