Reação de cultivares de soja à mela (Thanatephorus cucumeris) em campo em dois estádios de desenvolvimento das plantas.

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Author(s): NECHET, K. de L.; HALFELD-VIEIRA, B. de A.; GIANLUPPI, V.; MEYER, M. C.

Summary: RESUMO: A mela, causada pelo fungo Thanatephorus cucumeris, é uma das principais doenças da cultura da soja no estado de Roraima. O objetivo deste trabalho foi avaliar a reação de 15 cultivares de soja à mela em condições de cerrado em Roraima. Os parâmetros avaliados foram a porcentagem de área foliar infectada (AFI) no estádio R.5.5 e a porcentagem de vagens com sintoma de mela (VM) no estádio R. 6. Houve diferença significativa entre as cultivares testadas segundo o teste de Fisher LSD a 1% d e probabilidade nas duas avaliações. A AFI variou de 1,5% (cv. Padre) a 62% (cv.BR-36) e a VM de 8% (cv.UFV-9 e cv. Juçara) a 55% (cv. BR-36). A correlação entre as duas avaliações foi significativa e positiva. ABSTRACT: Rhizoctonia aerial blight (RAB), caused by the fungus Thanatephorus cucumeris is one of the most damaging diseases of soybean at Roraima, Brazil. The objective of this study was to evaluate the reaction of 15 soybean cultivars to RAB in a cerrado (savannah) ecosystem in the state of Roraima. The percentage of foliar area infected (FAI) and the percentage of pods with disease symptoms (WP) were evaluated on soybean plants at R.5.5 and R.6 growth stages, respectively. There were significative differences among cultivars tested based on Fisher LSD test in both evaluations. The FAI ranged from 1.5% (cv. Padre) to 62% (cv. BR-36) and WP from 8% (cv. UFV-9 and cv. Juçara) to 55 % (cv. BR-36). Significative and positive correlation was observed between the evaluations.

Publication year: 2008

Types of publication: Journal article

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