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Adoption of agricultural innovations is perceived as a key avenue for poverty reduction and improved food and nutritional security in developing countries. The International Centre for Insect Physiology and Ecology (icipe) has developed and implemented a set of Integrated Pest Management (IPM) strategies in several sub-Saharan African countries aimed at controlling mango infesting fruit flies (Bactrocera dorsalis). Although positive returns from the use of fruit fly IPM have already been documented, the impact of these technologies on food security is not well understood. This study evaluated the impact of the IPM strategy on food security with the help of a two-wave panel household survey data collected in Machakos County in Kenya. A difference-in-difference model was fitted to the data of a randomly selected sample of 600 mango growing households. A seven-day recall was used to elicit per capita calorie intake, while a 30-day recall was used to measure household dietary diversity. A before-and-after intervention and with-and-without (treatment and control) study design was utilized. The regression estimates indicate that fruit fly IPM use had a positive impact on per capita calorie intake but no significant effect on Household Dietary Diversity Index (HDDI) in comparison with the IPM non-users. This suggests that farmers using the fruit fly IPM technology benefit from income gains, and higher incomes improve the quantity of food consumed but not the diversity of the foods. This could be explained by a large share of the expenditure on food that was devoted to cereal staples such as maize, wheat, and rice as reported during the qualitative study. Other factors that had an effect on per capita calorie include the level of farm income, access to the extension services, wealth category and distance to agricultural input market and household size. This study recommends wider dissemination and upscaling of the fruit fly IPM strategy in mango producing regions to facilitate broader impacts on household-level food security.

This paper assesses the differences in technical efficiency of, and the cassava production systems employed by, male-managed (MMF) and female-managed (FMF) cassava farms in the Fanteakwa District of Ghana. The study employs the translog stochastic meta-frontier model to analyse data obtained from 300 randomly selected smallholder cassava farmers and finds an average metafrontier technical efficiency (MTE) of 0.06 and 0.03 among MMF and FMF respectively. The technology gap ratios (TGR) are 0.25 and 0.04 for the MMF and FMF respectively. The results suggest that both MMFs and FMFs are technically inefficient. However, the production technology operated on MMFs is relatively superior to that operated on FMFs, as shown by the relatively higher TGR for MMFs. The results also reveal that proximity to markets, extension access, off-farm economic activities and formal education are the major contributors to the technical efficiency of the farmers.

Globally, arthropod-borne virus (arbovirus) infections continue to pose substantial threats to public health and economic development, especially in developing countries. In Kenya, although arboviral diseases (ADs) are largely endemic, little is known about the factors influencing livestock farmers’ knowledge, beliefs, and management (KBM) of the three major ADs: Rift Valley fever (RVF), dengue fever and chikungunya fever. This study evaluates the drivers of livestock farmers’ KBM of ADs from a sample of 629 respondents selected using a three-stage sampling procedure in Kenya’s three hotspot counties of Baringo, Kwale, and Kilifi. A multivariate fractional probit model was used to assess the factors influencing the intensity of KBM. Only a quarter of the farmers had any knowledge of ADs while over four-fifths of them could not manage any of the three diseases. Access to information (experience and awareness), income, education, religion, and distance to a health facility considerably influenced the intensity of farmers’ KBM of ADs in Kenya. Thus, initiatives geared towards improving access to information through massive awareness campaigns are necessary to mitigate behavioral barriers in ADs management among rural communities in Kenya., Author summary Arboviral infection in humans and animals is on the rise globally due to expansion of vector habitats. Despite the economic and social impact of diseases caused by arboviral infection such as chikungunya, dengue, and Rift Valley fever, little is known in terms of community knowledge, beliefs, and management. Evaluating community knowledge, beliefs, and management practices of arboviral diseases is important for better policy guidance and public health investment. We conducted a survey in Kenya’s three hotspot counties of Baringo, Kwale, and Kilifi to understand the factors influencing knowledge, beliefs, and management of arboviral diseases. We found low levels of knowledge and poor managerial skills of arboviral diseases that were largely driven by access to information and asset ownership. Thus, community sensitization through improved access to information is important in increasing awareness and increase the management of arboviral diseases among rural communities in Kenya and other sub-Saharan African countries.

Thrips,Frankliniella occidentalis(Pergande), is a major invasive pest that causes extensive yield losses in French bean and tomato in Kenya. Thrips management is based on the application of pesticides. In addition to increased environmental risks associated with pesticides, frequent use of these chemicals increases production costs and pesticide resistance. Furthermore, exports are restricted due to non-compliance to maximum residue levels in important consumer export markets, especially the European Union (EU). This study was conducted to estimate the potential benefits of the effectiveness of theicipe-developed strategy for control of western flower thrips before dissemination of the technology in Kenya, using the economic surplus model. We calculated the benefit–cost ratio, the Net Present Value (NPV) and the Internal Rate of Return (IRR) using Cost–Benefit Analysis (CBA). Assuming a maximum conservative adoption rate of 1% and a 10% discount rate for the base deterministic scenario, the NPV of the research was estimated at US$2.2 million, with an IRR of 23% and a BCR of 2.46. Sensitivity analyses indicated that the NPV, IRR and BCR increased at an increasing rate as adoption rates increased. However, as elasticities of supply and demand increased, the NPV, IRR and BCR increased at a decreasing rate. The findings demonstrate that farmers from developing countries can gain when they obtain access to suitable pest management innovations such as integrated pest management technologies. Consequently, investment in IPM technologies for suppression of western flower thrips should be enhanced.

Food handling across the custody chain from production to consumption is one of the most important stages in which microbes can enter food from infected food handlers or due to cross-contamination. The wholesale produce market (WSPM), located in Doha, Qatar, is a good example of a custody chain in which a large amount of produce from different origins are purchased daily by restaurants, retailers, and individuals. However, no information is available on the food handling practices applied at the WSPM. Hence, this study was conducted to assess the self-reported hygiene practices and food safety knowledge of produce handlers at the WSPM as a baseline for food safety outreach. One hundred twenty produce handlers participated in this study to complete a structured questionnaire assessing food safety knowledge and hygiene practices. In addition, survey respondents' hands were swabbed to determine microbiological hand hygiene levels. Survey results revealed that none of the produce handlers had food safety knowledge or received training on safe produce handling practices. The median age group was 31 to 40 years, and over 57% had less than high school education. The level of self-reported knowledge on “food safety practices” displayed by produce handlers was not influenced by demographically based differences (e.g., age and years of experience), except education level. Note that 77% of produce handlers claimed to wash their hands four times per day; however, this good self-reported practice was not reflected in the microbial assessment of produce handlers' hands that had total aerobic and coliform counts ≥2 log CFU/cm2. Bacillus circulans (40%), Staphylococcus sciuri (25%), and Klebsiella pneumoniae (17%) were the most common bacteria isolated from produce handlers' hands. These findings may help public health agencies in Qatar establish guidelines for compulsory on-site training for produce handlers to improve knowledge on safe produce handling. This study was supported by a Graduate Sponsorship Research Award (GSRA) grant (GSRA2-1-0615-14038) from the Qatar National Research Fund (a member of the Qatar Foundation) and Qatar University Student Grant (QUST-CAS-SPR-2017-12). The findings achieved herein are solely the responsibility of the author(s). We thank the Microbiology Laboratory at Sidra Medicine and Center for Sustainable Development Laboratory at Qatar University for technical support. Scopus

Computational fluid dynamic (CFD) numerical simulations are providing alternative to experimental methods in preliminary analysis of aerodynamic behavior for large wind turbines. Shortcomings inherent by experimental methods have popularized the three dimensional CFD methods. This paper, therefore, presents a numerical analysis for NREL 5MW wind turbine rotor using a single moving reference frame approach. ANSYS Fluent is employed to model airflow over the blade’s surfaces using Reynolds average Navier–Stokes equations. A steady-state incompressible pressure based solver is applied in form of absolute velocity formulation. Four turbulence models are used: $$k-\omega$$ SST, $$k-\epsilon$$ RNG, $$k-\epsilon$$ realizable and Spalart Allmaras to determine the aerodynamic torque. Mesh independence study and validation is also performed. In addition, the predicted flap-wise bending load and comparison of pressure distribution for the four turbulence models are evaluated at different sections of the blade. Due to absence of experimental data for employed blade model, the obtained aerodynamic torque was compared with other reliable numerical simulation results.

This study was carried out to assess hygiene conditions, food handling practices, food safety knowledge of food service providers (FSPs), and the microbial quality of food served in different food service establishments in Doha. Fifty-three FSPs were randomly selected among 200 FSPs. Face-to-face interviews with the food safety managers at each participating FSP were conducted using a survey consisting of 40-questions (demographic data on workers, HACCP training, knowledge on personal hygiene, and safe-food handling practices) in October-December 2015. In addition to survey questionnaire, a checklist was used to determine the implementation of international food safety standards by observing actual practices applied at each FSP. All FSPs who took part in the initial survey were also invited to participate in one of three one-day educational workshops focused mainly on important components of food safety management system and held in 2016. At the time of workshops, each participant was also encouraged to take part in the microbial quality assessment study. Out of 53 establishments, only 10 FSPs (2 fine-dine-in, 2 casual sit-in, 2 catering, 2 fast-food, and 2 takeaway) accepted to provide food and swab samples from their entities. At the time of each visit to select FSPs, various menu items (food cooked in a short time, ready-to-eat foods, vegetables, dairy-based deserts, sandwiches, and raw seafood, e.g. oysters) were sampled in duplicate (based on the daily menu prepared at the time of sampling) at different food preparation stages (receiving, food storage, food preparation, holding/cooking, and serving). The microbial quality of food samples (n = 105) served and swabs collected from food preparation surfaces (n = 58) were also assessed using select media (APC, MCA, XLT4, and LSA). The identification of positive samples was carried out using VITEK-2 system. After the microbial assessment, a follow-up survey consisting of 24 questions was developed to determine the impact of the educational trainings on food service providers' daily operational practices. The FSP managers who participated in the initial survey were invited by phone or email or in person to take part in the follow-up survey. Out of 53 FSPs, only 16 were available to answer the questions due to reasons beyond the control of the research team. The major reasons for a low participation were 1) several managers moved back to their country without any contact information, 2) many of them changed their jobs and there was a no way of communicating with them since they did not provide an alternative email or a phone number. The survey results indicated that average service years of FSPs was 11, the average age of food safety managers interviewed was 33, most managers (66%) had college degree, and 68% of them were trained on HACCP. It was demonstrated that casual-sit-in and fine-dine-in restaurants are the only FSP types which consistently kept records (100%), followed by fast-food (36%), and catering (14%) FSPs. The microbial analysis indicated that the average APC in food samples collected from all FSPs met the international standards, while the APC counts of swab samples were considered unsatisfactory since the levels were above 106 Log10 CFU/cm2. The highest bacterial count was reported in swab samples (7.26 Log10 CFU/cm2) collected from preparation area in takeaway restaurants. Concerning the target organisms (Escherichia coli, Salmonella spp., and Listeria monocytogenes), among 105 food samples and 58 swab samples collected, 13 samples (8%) exhibited positive results for possible target pathogens. Positive samples were identified as Klebsiella pneumoniae, Klebsiella oxytoca, Pseudomonas aeruginosa, and Pantoea spp. Overall, the participants were highly satisfied (average score: 4.39/5 ± 0.20) with the information presented in the training workshops held in 2016, indicating that the workshops helped improve their knowledge on food safety; change their attitudes towards safe handling foods, and inform them about the changes on food safety laws and regulations in Qatar. These results provided insight information on the aspects of behavioural changes that confirm the value of intervention studies. One important note which is important to mention that the participating managers indicated that they need open communication between the policymakers and the FSPs to be able to make sure that they will not be left behind if there is any changes/updates on food safety rules and regulations applied in the country. This issue is going to be addressed by posting constant updates on GSO (food safety standards applied in Qatar) on the website recently developed and hosted under the Ministry of Public Health website. Results obtained in this study might help food safety managers in these select FSPs to better understand the need for implementing effective control measures in order to prevent contamination and eventually protect the public health.

Wind turbines must generate wind power cost-effectively for the wind power to remain viable and competitive among other renewable resources. The rotor diameter continues increasing in size to capture more energy to reduce the costs of wind power. However, the size of the rotor diameter is expected to reach limit due to restrictions related to the rotation of the entire blades, transport, and installation issues. This study, therefore, seeks to compare the effects of trailing edge flap and winglet embedded on the up-scale wind turbine blade. The investigated configurations are blade with winglet, blade with trailing edge flap and blade with a combination of the winglet and trailing edge flap. A straight blade of the NREL 5MW wind turbine was used as a benchmark to quantify effects of trailing edge flap and winglet. All simulations were performed using the ANSYS FLUENT. The steady pressure-based solver in absolute velocity formulation modelled the flow over the blade surfaces governed by Reynold-Averaged Navier-Stokes (RANS) equations closed with the k – ω SST turbulence model. Blades with trailing edge flap and combined trailing edge flap and winglet show similar effects in comparison of pressure coefficient at 0.32R, 0.60R and 0.92R. Blade with a winglet generates the highest aerodynamic torque, while blade with trailing edge flap decrease most of the flap-wise bending moment. The blade with combined trailing edge flap and winglet can serve as an alternative design for improving the wind turbine performance. That is, at the normal operating condition the trailing edge flap can be held at its neutral position whenever increment of the power is the primary target.

The community-based animal health workers (CBAHWs) model has been one of the ways utilised in delivery of animal health services following the veterinary service reforms. Government statutory bodies have opposed the establishment of these programs arguing that their approach to animal health delivery does not fit within the existing technical, legal and policy framework. This study gives an account of the nature, characteristics, and activities of CBAHWs and provides information that would guide policy debate regarding their integration into formal health service delivery. It indicates that these programs provide mainly curative health services but the issue of sustainability has continued to dodge most of them. It establishes that, for trainees to continue actively providing services, continued professional development obtained through regular refresher training and entrepreneurship exemplified by proper record keeping are important. It therefore recommends that policy review is needed to address the role of CBAHWs and appropriately integrate their activities within the formal animal health delivery system.

Africa lacks a steady supply of good quality seed due in part to lack of timely development and conveyance of seed technologies to farmers. This study evaluated the performance of national seed systems of five countries in eastern and southern Africa where a consortium of public-private organizations are implementing the Water Efficient Maize for Africa (WEMA) project. WEMA aimed at developing and deploying drought-tolerant and insect-pest-protected maize hybrids (climate-smart hybrids) to smallholder farmers royalty-free. The objectives of the study were to assess the main components of the seed maize systems, their institutional frameworks, and estimate the potential demand for WEMA climate-smart hybrid maize seed to guide in upscaling the seed technology to other African countries. Primary data was gathered from key experts in the seed maize value-chain of each country. Secondary data came from national statistics bureaux to estimate the potential demand for WEMA seed maize. Results showed that farmers in all five countries except South Africa overwhelming rely on the informal seed system. The formal seed system is over-regulated creating unnecessary delays in the release and commercialization of improved seed varieties. It also increases the cost of developing new seed technology. Except South Africa, the demand for seed maize in the other four WEMA countries will grow by 4.1% annually from 31,614 to 35,863 metric tons of certified seed over 2014-2020 period. The study advances several recommendations to improve the efficiency of the seed maize systems, which when implemented, will undoubtedly improve food security in Africa.

This study was conducted to evaluate occurrence of organochlorine pesticide residues in Oreochromis niloticus fish reared by aquaculture in Kiambu and Machakos Counties. A total of 213 fish organ samples were analyzed for organochlorine pesticide residues from Kiambu and Machakos Counties in Kenya using gas–liquid chromatography. Overall, betahexachlorocyclohexane (BHC) group, the cyclodiens, aldrin, heptachlor, dieldrin, endrin and the Dichlodiphenyltrichloroethane (DDT) group of compounds were detected in fish samples. p,p′-DDT and its metabolite p,p′-DDD were detected in the muscle, liver and gonad and their concentration ranged between not detectable (ND) to 0.916 μg kg−1 for p,p′-DDT and ND to 1.684 μg kg−1 for p,p′-DDD. Brain had the highest concentration of DDT metabolites o, p′-DDT (2.098 ± 4.097 μg kg−1) and p′ p-DDD (1.684 ± 3.666 μg kg−1). Organochlorine pesticide residues were generally higher in Kiambu County compared to Machakos County but there was no significant difference. The residue levels of organochlorines in all fish samples analyzed were lower than the benchmark levels set by FAO, FDA, and NAS/NAE.