Levantamento de raças fisiológicas da ferrugem da folha do trigo (Puccinia recondita) no Sul do Brasil

From 1958 to 1969, a total of 1906 isolates of the wheat leaf rust fungus (Puccinia recondita Rob. ex. Desm.) were made from material collected in the wheat-growing regions of southern Brazil. In order to differentiate the races of the fungus, a group of wheat cultivars of regional interest was used. The isolates were classified as races using the prefix IAS 58. The following IAS 58 races were determined; 2, 2A, 4, 4A, 6, 7, 7A, 10, 10A, 11, 16, 17, 19, 19A, 20, 20A, 21, 21A, 22, 22A, 24, 24A, 25, 26, and 27. The races 25 and 26 were first determined on samples collected in 1961, and race 27 in 1962. Races and subraces of groups 19 and 4 as a rule predominated. With the exception of those of group 2, other races and subraces appeared only sporadically.Em amostras de ferrugem da folha do trigo (Puccinia recondita Rob. ex. Desm.), colhidas de 1958 a 1969, nas zonas tritícolas brasileiras, realizaram-se 1906 isolamentos. A série diferencial usada era constituída por um grupo de variedades de interesse regional. As amostras foram classificadas pelo grupo de raças IAS 58. Foram determinadas as seguintes raças IAS 58: 2, 2A, 4, 4A, 6, 7, 7A, 10, 10A, 11, 16, 17, 19, 19A, 20, 20A, 21, 21A, 22, 22A, 24, 24A, 25, 26 e 27. As raças 25 e 26 foram determinadas, pela 1.a vez, em amostras colhidas em 1961, e a 27, em 1962. Foram prevalentes as raças dos grupos 19 e 4 e, em alguns anos, também a raça 2