10/4/2023 0 Comments Early blight potato diseases![]() First report of Alternaria tomatophila and A. Up until 2009, it was believed that early blight in potato in Brazil was caused only by Alternaria solani, but after studies carried out by ( RODRIGUES et al., 2010 RODRIGUES T.T.M.S. solani indica a possibilidade de ocorrência do ciclo parassexual.Īlternaria grandis Alternaria solani compatibilidade micelial agressividade resistência genética.Įarly blight is one of the major fungal diseases of potato ( Solanum tuberosum L.) and other Solanaceae. A ocorrência de compatibilidade micelial entre isolados de A. grandis apresentaram IVCMs superiores e, portanto, crescimento micelial mais rápido. solani apresentaram comportamento semelhante quanto à agressividade. A metodologia de avaliação precoce in vitro da reação dos genótipos à severidade da pinta-preta foi eficiente para os isolados de ambas as espécies de Alternaria. foram avaliados quanto ao índice de velocidade de crescimento micelial (IVCM) e a formação de grupos de compatibilidade micelial (GCM). As plântulas, obtidas in vitro, foram inoculadas com os isolados de Alternaria spp., incubadas e classificadas quanto à severidade. Foram avaliados 22 genótipos do Programa de Melhoramento Genético de Batata da UFLA, sendo duas cultivares, padrões de resistência e suscetibilidade. O objetivo deste trabalho foi avaliar, in vitro, a reação de genótipos de batata à pinta-preta e comparar as espécies Alternaria grandis e Alternaria solani, por meio da avaliação de características fisiológicas. grandis indicated the possible occurrence of parasexual cycle.Īlternaria grandis Alternaria solani mycelial compatibility aggressiveness genetic resistance.Ī pinta preta é uma das doenças fúngicas mais importantes da cultura da batata. The occurrence of mycelial compatibility among isolates of A. ![]() grandis MGI's had higher, and therefore mycelium grew faster when compared to those isolated from A. grandis were similar in their aggressiveness. The methodology for evaluating the in vitro reaction of genotypes to severity of early blight was efficient for both isolates. were evaluated for mycelial growth index (MGI) and for formation of mycelial compatibility groups (MCG). These were incubated in severity and classified according to the rating scale. Plantlets obtained in vitro were inoculated with a 5mm diameter mycelial disk of isolates Alternaria spp. Twenty-two genotypes of the Potato Breeding Program at UFLA, two cultivars, Aracy and Bintje, patterns of resistance and susceptibility, respectively were evaluated. The objective of this study was to evaluate the in vitro reaction of potato genotypes to the severity of early blight and compare the species Alternaria solani and Alternaria grandis, etiologic agents of disease, through the evaluation of physiological characteristics. Spray again after a few weeks to protect new growth.Early blight is one of the most important fungal diseases of potato. Start from June, especially if the weather’s wet. Spray potato crops with a protective fungicide before signs of blight appear. ![]()
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