Virulence of Puccinia recondita f. sp. tritici in the United States in 1986

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Abstract
Isolates of Puccinia recondita f. sp. tritici were obtained from wheat [Triticum aestivum] leaf collections made by cooperators throughout the United states and from cereal rust field surveys of the Great Plains and Gulf Coast states in 1986. Testing of 972 isolates for virulence to 14 single-gene differentially resistant test lines showd 44 virulence/avirulence phenotypes, which were categoreized into 11 Unified Numeration (UN) races. An increased frequency of virulence to Lr24 over recent years was found, and combined virulence to Lr24 and 26 was observed for the first time. No virulence was found to 11 of 21 additional entries in a resistant test series. Regional rate distribution patterns again suggested that the central United states was single epidemiological unit.