7 documents found, page 1 of 1
Genotypic and pathogenic diversity of Colletotrichum sublineola isolates from S...
Mizubuti, E. S. G.; Xavier, K. V.; Queiroz, M. V.; Chopra, S.; Vaillancourt, L.Anthracnose caused by Colletotrichum sublineola is an important disease of cultivated sorghum (Sorghum bicolor) worldwide. Anthracnose is also common on the ubiquitous wild sorghum relative Johnsongrass (S. halepense). Analysis of repetitive molecular fingerprinting markers revealed that isolates of C. sublineola from both hosts in the southeastern United States were genotypically diverse, with relatively few h...
The population structure of Hemileia vastatrix in Brazil inferred from AFLP
Maia, T. A.; Caixeta, E. T.; Mizubuti, E. S. G.; Zambolim, L.; Maciel-Zambolim, E.Efforts to obtain durable resistant cultivars to coffee leaf rust have a long history of disappointment because of the lack of information on the Hemileia vastatrix evolutionary potential. In this study, the AFLP marker was used to analyze the genetic structure of a field population of H. vastatrix from different coffee genotypes cultivated in a wide geographic region of Brazil’s main production areas. A total ...
Aggressiveness and host specificity of Brazilian isolates of Phytophthora infes...
Suassuna, N. D.; Maffia, L. A.; Mizubuti, E. S. G.The population of Phytophthora infestans in Brazil consists of two clonal lineages, US-1 associated with tomatoes and BR-1 associated with potatoes. To assess whether host specificity in these lineages resulted from differences in aggres- siveness to potato and tomato, six aggressiveness-related epidemiological components – infection frequency (IF), incu- bation period (IP), latent period (LP), lesion area (LA)...
The field resistance of potato cultivars to foliar late blight and its relation...
Duarte, H. S. S.; Zambolim, L.; Mizubuti, E. S. G.; Pádua, J. G.; Ribeiro Júnior, J. I.; Nogueira Júnior, A. F.; Carmo, E. L.The use of resistant cultivars is the preferred control method for plant diseases. This approach is attractive owing to its high efficacy, low cost, and ease of implementation. This work aimed to assess the resistance of potato cultivars to foliar late blight (Phytophthora infestans) under different environmental conditions. It further aimed to assess the relationships between resistance to foliar late blight a...
Validation of decision support systems for tomato early blight and potato late ...
Batista, D. C.; Lima, Marcello Arrais; Haddad, Fernando; Maffia, Luiz Antônio; Mizubuti, E. S. G.Early and late blight are the most important foliar diseases of tomato and potato crops in Brazil. Decision support systems (DSS) are important tools in reducing the large amount of fungicides applied to suppress disease intensity. Systems developed for early or late blight were validated in two cropping seasons under Brazilian conditions. For tomato early blight, FAST, CUFAST, and TOMCAST systems were compared...
Histopathological study of the Alternaria solani infection process in potato: c...
Dita, M. A.; Mizubuti, E. S. G.; Matsuoka, K.; Brommonschenkel, S. H.Histopathological analyses of the infection process of Alternaria solani were accomplished in three potato cultivars with different levels of early blight resistance. Leaflets of Aracy (resistant), Delta (moderately resistant) and Bintje (susceptible) cultivars were inoculated at the beginning of the flowering stage. In order to study the effect of leaf age, leaf samples were collected separately, in the lower,...
Biological control by Clonostachys rosea as a key component in the integrated m...
Cota, L. V.; Maffia, L. A.; Mizubuti, E. S. G.; Macedo, P. E. F.Gray mold, caused by Botrytis cinerea, is an important strawberry disease. As gray mold control is difficult, there is a need to evaluate integrated methods to successfully manage the disease. The efficiency of integrating Clonostachys rosea sprays, fungicide sprays, and crop debris removal to manage gray mold was evaluated in field experiments conducted in 2006 and 2007. Leaf colonization by C. rosea (LAC), av...