Races ofPuccinia graminisf. sp.avenaein the United States and Mexico During 1981

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Abstract
Overwintering oat stem rust in southern Texas in 1981 produced a large quantity of inoculum. Subsequent infections occurred earlier in the year than normal in the north central states, but earlier than normal planting dates nullified much of the effect of an early disease onset. The 1530 isolates from 555 uredial collections from the USA consisted of North American (NA) races NA-27, 95%; NA-16, 3%; and NA-5, 1%. No virulence was detected for oat lines with genes Pg-13, -16, and -a or the host lines Saia, S.E.S. Selection No. 52, Kyto, CI9221, and X-1588-2 in the USA.