Controle químico da ferrugem (Hemileia vastatrix Berk &amp; Br.) do cafeeiro através de diferentes esquemas de aplicação

Chalfoun, Sara Maria; Carvalho, Vicente Luiz de

doi:10.1590/s0100-204x1999000300006

Cited by 7 publications

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References 2 publications

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“…Optimal conditions for the disease development are temperatures between 22°C and 24°C and relative humidity higher than 80% (Montoya and Chaves ; Dejong et al. ; Kushalappa and Eskes ; Chalfoun and Carvalho ; Zambolim et al. ).…”

Section: Discussionmentioning

confidence: 99%

Variation in Aggressiveness Components in the Hemileia vastatrix Population in Brazil

Maia

Badel

Fernandes

et al. 2017

Journal of Phytopathology

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The Pucciniomycete fungus Hemileia vastatrix causes leaf rust on coffee trees. The pathogen is responsible for considerable yield losses in susceptible coffee cultivars if appropriate management strategies are not implemented. Rapid spread and epidemics of rust fungi are usually associated with the emergence of new races of the pathogen that overcome resistance or with the emergence of more aggressive populations of the pathogen. In Brazil, coffee production is dominated by susceptible cultivars of Coffea arabica and Coffea canephora. We assessed aggressiveness in 46 populations of H. vastatrix from Minas Gerais and Esp ırito Santo, two of the most important coffee-producing states in Brazil. We observed a significant difference in the incubation period between the populations from Minas Gerais and Esp ırito Santo when 183 single-pustule isolates were inoculated onto Catua ı Vermelho IAC 44, a susceptible C. arabica cultivar. Variation in aggressiveness components was observed between and within localities. Isolates with longer incubation periods also tended to have longer latent periods, although there was only a low correlation between these two aggressiveness components (r 2 = 0.34, P = 2.2 9 10 À16 ). Lowsporulating isolates also had significantly longer incubation and latent periods. The H. vastatrix population from Minas Gerais and Esp ırito Santo is structured by the formation of groups of individuals with differential level of aggressiveness. Our results indicate that the variation in aggressiveness of the Brazilian H. vastatrix population may be associated with the geographic coffee-producing areas. Zambolim et al. 1999).Coffee leaf rust is a polycyclic disease, that is, successive rounds of urediniospores are produced and susceptible plant tissue is infected several times during

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Section: Discussionmentioning

confidence: 99%