Search

Your search keyword '"Silva, Dagma Dionísia"' showing total 30 results
Start Over Author "Silva, Dagma Dionísia"
30 results on '"Silva, Dagma Dionísia"'

7. Detection and Factors That Induce Stenocarpella spp. Survival in Maize Stubble and Soil Suppressiveness under Tropical Conditions

Author

Pinto, Felipe Augusto Moretti Ferreira, primary, Porto, Victor Biazzotto Correia, additional, Guimarães, Rafaela Araújo, additional, Siqueira, Carolina da Silva, additional, Faria, Mirian Rabelo de, additional, Machado, José da Cruz, additional, Medeiros, Henrique Novaes, additional, Silva, Dagma Dionísia da, additional, Santos Neto, Helon, additional, Pozza, Edson Ampelio, additional, and Medeiros, Flávio Henrique Vasconcelos de, additional

Published
2022
Full Text
View/download PDF

8. Antifungal activity of bacterial strains from maize silks against Fusarium verticillioides

Author

de Fátima Dias Diniz, Gisele, primary, Cota, Luciano Viana, additional, Figueiredo, José Edson Fontes, additional, Aguiar, Frederick Mendes, additional, da Silva, Dagma Dionísia, additional, de Paula Lana, Ubiraci Gomes, additional, dos Santos, Vera Lúcia, additional, Marriel, Ivanildo Evódio, additional, and de Oliveira-Paiva, Christiane Abreu, additional

Published
2021
Full Text
View/download PDF

9. Application of near-infrared hyperspectral (NIR) images combined with multivariate image analysis in the differentiation of two mycotoxicogenic Fusarium species associated with maize

Author

da Conceição, Renata Regina Pereira, primary, Simeone, Maria Lúcia Ferreira, additional, Queiroz, Valéria Aparecida Vieira, additional, de Medeiros, Everaldo Paulo, additional, de Araújo, Joabson Borges, additional, Coutinho, Wirton Macedo, additional, da Silva, Dagma Dionísia, additional, de Araújo Miguel, Rafael, additional, de Paula Lana, Ubiraci Gomes, additional, and de Resende Stoianoff, Maria Aparecida, additional

Published
2021
Full Text
View/download PDF

10. Genetic variability of Colletotrichum sublineolum through ISSR markers

Author

Guimarães, Thallita Santos, primary, Barelli, Marco Antonio Aparecido, additional, Corrêa, Carla Lima, additional, Silva, Valvenarg Pereira da, additional, Floriano, Alex Junior Sandol, additional, Sander, Nilo Leal, additional, Duarte, Aline Vidor Melão, additional, Zago, Bruno Wagner, additional, Ribeiro, Jackson Lauro Borges, additional, Tardin, Flávio Dessaune, additional, and Silva, Dagma Dionísia da, additional

Published
2021
Full Text
View/download PDF

11. Physiological and biophysical alterations in maize plants caused by Colletotrichum graminicolainfection verified by OJIP study

Author

Campos, Leonardo José Motta, de Almeida, Rodrigo Estavam Munhoz, da Silva, Dagma Dionísia, Cota, Luciano Viana, Naoe, Alessandra Maria Lima, Peluzio, Joênes Mucci, Bernardes, Fernanda Pinheiro, and da Costa, Rodrigo Veras

Abstract

Anthracnose caused by Colletotrichum graminicola(Ces.) Wils is among the most aggressive maize diseases worldwide, considerably hindering crop productivity. To investigate the responses underlying the host–pathogen interaction involved in anthracnose infection, we conducted two field experiments in some of the main grain producing areas of the State of Tocantins, in Brazil. Four maize hybrids (with differential tolerance to C. graminicola) were sown in February and March, 2017. Chlorophyll fluorescence measures were performed according to the OJIP protocol; additionally, SPAD readings were conducted and productivity components were assessed. Inoculation with the fungus spore suspension affected the response curve of the chlorophyll fluorescence transient, SPAD index, and productivity components. Anthracnose stalk rot caused 20–25% reduction in grain weight, 6–8% reduction in maize ear size, and 20–23% reduction in ear weight. Furthermore, plants experiencing C. graminicolarot showed reduced SPAD index and a 24–34% reduction in the activity indicator of PSII (PITotal). These changes in the photosynthetic apparatus were successfully observed via chlorophyll fluorescence measurements.

Published
2021
Full Text
View/download PDF

13. Yield losses in off-season corn crop due to stalk rot disease

Author

Costa, Rodrigo Véras da, primary, Simon, Jones, additional, Cota, Luciano Viana, additional, Silva, Dagma Dionísia da, additional, Almeida, Rodrigo Estevam Munhoz de, additional, Lanza, Fabrício Eustáquio, additional, Lago, Bruno Cocco, additional, Pereira, Alan Alves, additional, Campos, Leonardo José Motta, additional, and Figueiredo, José Edson Fontes, additional

Published
2019
Full Text
View/download PDF

19. Viabilidade técnica e econômica da aplicação de estrobilurinas em milho

Author

Costa, Rodrigo Véras da, Cota, Luciano Viana, Silva, Dagma Dionísia da, Meirelles, Walter Fernandes, and Lanza, Fabrício Eustáquio

Subjects
azoxistrobina, pyraclostrobin, piraclostrobina, azoxystrobin, efeito fisiológico, Zea mays, physiological effect
Abstract

Nos últimos anos, grande ênfase tem sido dada ao uso de fungicidas para o manejo de doenças foliares na cultura do milho no Brasil. Esse trabalho teve como objetivo a realização de uma análise da viabilidade técnica e econômica da aplicação de fungicidas no rendimento de cultivares de milho em diferentes regiões produtoras. Foram conduzidos experimentos para avaliação do efeito da aplicação de fungicidas no rendimento de diferentes cultivares de milho, em três localidades: Sete Lagoas (MG), Londrina (PR) e Rio Verde (GO). Foram consideradas a não aplicação, uma e duas aplicações de fungicidas em cada cultivar. Foram avaliadas a severidade das doenças foliares e o rendimento de cada cultivar. Os resultados de rendimento das cultivares tratadas com fungicidas apresentaram elevada inconsistência em condições de baixa severidade de doenças. Maior frequência de rendimentos positivos e benefício econômico ocorreu quando as aplicações de fungicida foram realizadas em condição de elevada pressão de doença. Mais estudos são necessários para o melhor entendimento do efeito dos fungicidas do grupo das estrobilurinas na fisiologia e na produção de plantas de milho. In recent years, great emphasis has been given to the use of fungicides for managing foliar diseases in corn in Brazil. This study aimed to conduct an analysis of technical and economic feasibility of application of fungicides on maize in different growing regions. Trials were conducted to evaluate the effect of fungicides on the yield of different maize cultivars at three locations: Sete Lagoas (state of Minas Gerais), Londrina (state of Paraná) and Rio Verde (state of Goiás). The effect of one and two fungicide applications on each cultivar was evaluated. For each trial, the difference in mean yield and disease severities between treated and untreated plots for each cultivars was compared. For all trials, yield response of cultivars treated with fungicides was highly inconsistent under low disease severity. A higher frequency of positive yields and economic benefit occurred when fungicide applications were made under conditions of high disease pressure. More studies are needed to better clarify the effect of strobilurin fungicides on the physiology and production of corn plants.

Published
2012

22. Diversidade populacional de Colletotrichum sublineolum em seis localidades no Brasil

Author

Silva, Dagma Dionísia da, Casela, Carlos Roberto, Castro, Hilário Antônio de, Santos, Fredolino Giacomini dos, and Ferreira, Alexandre da Silva

Subjects
Diversidade fenotípica, Simpson, Shannon, Sorghum bicolor, Complexidade de raças, Gleason and Complexity indexes
Abstract

Foi objetivo deste trabalho caracterizar a população de Colletotrichum sublineolum Henn. por meio da avaliação da virulência de 289 isolados monospóricos do patógeno. Foram utilizadas como diferenciadoras 10 linhagens elites do programa de melhoramento genético de sorgo da Embrapa Milho e Sorgo. Os isolados de C. sublineolum foram obtidos de folhas de sorgo provenientes de Palmeira de Goiás e Goiânia, GO, Sete Lagoas, Ipiaçu e Uberlândia, MG, e Jardinópolis, SP e designados de acordo com um sistema binário de classificação de raças. As populações foram também caracterizadas quanto à diversidade fenotípica, por meio de índices de Shannon, de Gleason e de Simpson, e de um índice de complexidade, e quanto a sua distribuição e freqüência nas seis localidades. Somente a raça 31.04 foi encontrada nos seis locais avaliados e foi a raça mais freqüente em Uberlândia, Ipiaçu e Palmeira de Goiás. A raça mais complexa, 31.31, foi a mais freqüente em Sete Lagoas e Goiânia e não foi observada somente em Palmeira de Goiás. Verificou-se que as raças mais freqüentes em cada localidade apresentaram-se, em sua maioria, bem distribuídas nas seis regiões avaliadas. O local com maior diversidade fenotípica foi Jardinópolis, de acordo com os índices de Shannon, Simpson e Gleason. O maior índice de complexidade de raças foi encontrado em Sete Lagoas e Goiânia, seguidas por Jardinópolis, Ipiaçu, Uberlândia e Palmeira de Goiás, respectivamente. Houve correlação entre os índices de Shannon e Gleason, mas não entre os índices de diversidade e de complexidade. The objective of this work was to characterize Colletotrichum sublineolum Henn. population by evaluating virulence of 289 single spore isolates of the pathogen in sorghum 10 elite lines of the breeding program of Embrapa Maize and Sorghum Research Center, utilized as differentials. Isolates were obtained of sorghum leaves from Palmeira de Goiás and Goiânia, GO, Sete Lagoas, Ipiaçu and Uberlândia, MG, and Jardinópolis, SP and designated according to a binary system of classification. Populations were also characterized for phenotypic diversity according to the Shannon, Gleason and Simpson indexes, a complexity index, and according to their frequency and distribution. Race 31.04 was present in all six locations and was the predominant phenotype in Uberlândia, Ipiaçú, and Palmeira de Goiás. The complex race 31.31, was the most frequent in Sete Lagoas and Goiânia and was not observed only in Palmeira de Goiás. The most frequent races were also the ones with a uniform distribution throughout the six locations. The highest phenotypic diversity, according to the Shannon, Simpson and Gleason indexes, was observed in Jardinópolis. The highest complexity index was found in Sete Lagoas and Goiânia, followed by the indexes of Jardinópolis, Ipiaçu, Uberlândia and Palmeira de Goiás, respectively. A significant correlation between Shannon and Gleason indexes was observed. On the other hand, diversity and complexity indexes were not significantly correlated.

Published
2008

29. Silicon and Fungicide Effects on Anthracnose in Moderately Resistant and Susceptible Sorghum Lines.

Author

Resende, Renata Sousa, Rodrigues, Fabrício Ávila, Costa, Rodrigo Veras, and Silva, Dagma Dionísia

Subjects
SORGHUM disease & pest resistance, FUNGICIDES, EFFECT of silicon on plants, DISEASE susceptibility, ANTHRACNOSE, PLANT nutrition, EXPERIMENTS
Abstract

This study aimed to evaluate the effect of silicon ( Si) and its interaction with fungicide on the management of sorghum anthracnose. The experiments were carried out in Si-deficient soil in the 2008/2009 and 2009/2010 growing seasons in a randomized, complete block, split-split plot design with four replications. Calcium silicate ( CS) and lime ( L), at the rates of 6 and 5 ton/ha, respectively, were randomly assigned to the main plot. Two sorghum lines, BR-008 (resistant) and BR-009 (susceptible), were assigned to the split plots. The split-split plots corresponded to with or without the fungicide Opera® (epoxiconazole + pyraclostrobin). The residual effect of CS and L from the 2008/2009 growing season was evaluated in the 2009/2010 growing season. For the 2008/2009 growing season, the area under anthracnose progress curve ( AUAPC) was reduced by 39 and 42% for lines BR-008 and BR-009, respectively, with the application of CS. In the presence of the fungicide, the AUAPC was reduced by 35 and 42% for the CS and L treatments, respectively. Calcium silicate with and without fungicide contributed to decreasing the AUAPC by 44 and 37%, respectively. The fungicide spray decreased the AUAPC by 50 and 39% for lines BR-008 and BR-009, respectively. Without fungicide, the AUAPC decreased by 88% for line BR-008 compared with line BR-009; however, with fungicide, the reduction reached 90%. The Si leaf tissue concentration significantly increased with the CS application (5.9 g/kg) compared with the L application (0.3 g/kg), regardless of the sorghum line. The yield increased by 0.6 ton/ha with the CS compared to the L application. The fungicide increased yield by 0.48 ton/ha compared with the non-fungicide spray treatment. The residual effect of CS in the soil increased Si leaf tissue concentration and yield as well as reduced the intensity of anthracnose in the 2009/2010 growing season. [ABSTRACT FROM AUTHOR]

Published
2013
Full Text
View/download PDF

30. RESISTÊNCIA DE LINHAGENS GENITORAS E HÍBRIDOS SIMPLES DE SORGO A Colletotrichum sublineolum, AGENTE CAUSAL DA ANTRACNOSE.

Author

PEREIR, IGOR SOUZA, DA SILVA, DAGMA DIONÍSIA, CASELA, CARLOS ROBERTO, TARDIN, FLÁVIO DESSAUNE, and DE ABREU, MARIO SOBRAL

Subjects
SORGHUM, DISEASE resistance of plants, ANTHRACNOSE, COLLETOTRICHUM sublineolum, PLANT genetics
Abstract

Copyright of Revista Caatinga is the property of Revista Caatinga and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2011

Catalog

Books, media, physical & digital resources
See catalog results