Evaluation of pathogenic populations of wheat powdery mildew

Abstract

Samples from several wheat growing regions were considered in the evaluation of the pathogenic populations of Erysiphe graminis f. sp. tritici Marchal. It was concluded that only the gene combination of the cultivar Khapli - Pm₄a + ... plus two unknown genes - maintained the resistance in all tests realized. According to the average coefficient of infection, the gene Pm₄b and the combination Pm₂ + Mld, also can be considered of good performance in a complete evaluation since 1980.