Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/28218
Título: Transmissão de Colletotrichum gossypii var. cephalosporioides e Corynespora cassiicola associados à sementes de algodão e soja tratadas com produtos químicos
Título(s) alternativo(s): Transmission of Colletotrichum gossypii var. cephalosporioides and Corynespora cassiicola associated with cotton and soybean seed treated with chemicals
Autores: Machado, José da Cruz
Abreu, Mário Sobral de
Siqueira, Carolina da Silva
Palavras-chave: Algodão – Sementes – Doenças e pragas
Soja – Sementes – Doenças e pragas
Ramulose
Mancha alvo
Cotton – Seeds – Diseases and pests
Soybean – Seeds – Diseases and pests
Ramulosis
Target spot
Colletotrichum gossypii
Corynespora cassiicola
Data do documento: 6-Dez-2017
Editor: Universidade Federal de Lavras
Citação: FRANÇOSO, J. Transmissão de Colletotrichum gossypii var. cephalosporioides e Corynespora cassiicola associados à sementes de algodão e soja tratadas com produtos químicos. 2017. 53 p. Dissertação (Mestrado em Agronomia/Fitopatologia)-Universidade Federal de Lavras, Lavras, 2017.
Resumo: Cotton and soybean crops are prominent among the main agricultural crops in Brazil, since they significantly contribute to the development of Brazilian agriculture. However, the productivity of these cultures can be widely affected by biotic and abiotic factors. Among biotic factors, ramulosis, caused by Colletotrichum gossypii var. cephalosporioides, and target spot, caused by Corynespora cassiicola, derived from infected seeds and crop remains, have caused significant losses in productivity. As alternative controlling these pathogens, products comprised of different fungicides have been widely used. The objective in this study was to evaluate the transmission rate of Colletotrichum gossypii var. cephalosporioides and Corynespora cassiicola using infected seeds and seeds treated with different chemical products. Seeds infected by both pathogens were obtained by using the osmotic conditioning technique, as described in literature. For cotton seeds, the time of exposure to the fungal colony was of 36 hours, while for soybean seeds, time of exposure was of 48 hours. The seeds were posteriorly treated with the chemical products, totalizing five treatments. Sanity, germination, seed and seedling vigor, as well as transmission rates of the fungi were evaluated for both pathosystems. The trials were conducted in laboratory and in plant growth chambers at temperatures of 20°C and 27°C. All tested chemical treatments were effective in reducing the effects of the pathogens and the rates of total transmission in up to 60.54% for C. gossypii var. cephalosporioides, and 85.67% for C. cassiicola. None of the pathosystems presented complete eradication of infective inoculum of the pathogens. With the conditions under which this work was performed, no chemical product was capable of avoiding the transmission of Colletotrichum gossypii var. cephalosporioides and Corynespora cassiicola from the infected cotton and soybean seeds.
URI: http://repositorio.ufla.br/jspui/handle/1/28218
Aparece nas coleções:Agronomia/Fitopatologia - Mestrado (Dissertações)



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