The phenotypic diversity between and within different groupings of Puccinia recondita f. sp. tritici isolates in 1990 in Canada was determined. The diversity and prevalence of virulence phenotypes were compared in collections from resistant and susceptible cultivars in the prairie provinces and from winter and spring wheats in the eastern provinces. The eastern P. r. tritici population (Quebec and Ontario) was dominated by one virulence phenotype at 57%, and 25 other phenotypes occurred at less than 10% each (.)
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J. A. Kolmer (1992) studied this question.