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Identificação de raças fisiológicas da ferrugem ( Uromyces phaseoli typica Arth.) do feijoeiro ( Phaseolus vulgaris L.) em duas regiões fisiografias do Rio Grande Do Sul, Brasil

1968; Embrapa Informação Tecnológica; Volume: 3; Issue: 1 Linguagem: Inglês

1678-3921

Ivanoska R. Dias F.a, Joaquim C. da Costa,

Yeasts and Rust Fungi Studies

In 1965 and 1966 a survey was made of physiologi cal races of rust ( Uromyces phaseoli var. typica Arth.) of beans ( Phaseolus vulgaris L.) from samples collec ted on the Encosta do Sudeste in the counties of Pelotas and Sao Lourenco and on the Serra do Su deste in the counties of Piratini and Gangucu of Rio Grande do Sul, Brazil. Fifteen races were identified by use of the reaction of six differential varieties adopted by Harter and Zaumeyer (1941) following the scale of reading of reaction of the varieties adopted by Harter and Dongo and Crispin (1962). The races of greatest frequency were B 1 and B 2 du ring 1965 and 1966. Races B 2 , B 3 , B 5 and B 10 increased in 1966; whereas races B 1 , B 4 , B 6 , B 7 , B 8 and B 11 decreased. Race B15 remained constant. Races B12 and B14 were isolated only in 1965 and B12 only in 1966.