Abstract:Virulence in Puccinia graminis f.sp. avenue has been studied in Canada since 1921. Changes in host resistance, the succession of avirulence–virulence combinations, and changes in the composition of the pathogen population during the ensuing 57 years are presented graphically and indicate that the organism is highly dynamic even when the host population is relatively static. The early years are characterized by the presence of races virulent only on the universally susceptible host or cultivars with a single re… Show more
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