PATHOGENICITY OF Fusarium graminearum ON CREOLE BEANS: GERMINATION, VIGOR AND SEEDLING DAMAGE

Abstract

The objective of this study was to evaluate the pathogenicity of Fusarium graminearum on creole bean seeds, quantify the incidence of root lesions and damping off in seedlings, and evaluate the reduction of germination and seed vigor. Two varieties of creole beans, 'Cavalo' and 'Chumbinho', were collected from a family property located in the municipality of Severiano de Almeida, state of Rio Grande do Sul, Brazil. The treatments evaluated were: seeds not inoculated (T1) and inoculated (T2) with F. graminearum macroconidia suspension at a concentration of 8.0 x 10 5 macroconidia mL-1 , and the appearance of lesions and influence on vigor and germination were observed. The variety 'Cavalo' proved to be more susceptible to F. graminearum, expressing vigor reduction, incidence of root lesions and damping off. The variety 'Chumbinho' expressed no vigor reduction, although it has occurred reduced incidence of damping off. Regarding root lesions, the 'Chumbinho' variety compares to the variety 'Cavalo'.