Races ofPuccinia graminisf. sp.avenaein the United States and Mexico in 1980

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Abstract
The only known overwintering site for oat stem rust in the USA in 1980 was in a Beeville, Texas, nursery. Surveys of Mexico in April and May found little rust in commercial fields. Disease incidence increased in Texas nurseries, and rust appeared earlier in the year than normal in the north central states; however, the earlier than normal plant maturity negated the effect of the early initial infections. The 1150 isolates from 434 uredial collections from the USA consisted of 78% race NA-27, 11% NA-16, and 9% NA-5. No virulence for oat lines with genes Pg-9, -13, -16 and -a and the host lines Saia, CI 9221, S.E.S. Selection No. 52, X-1588-2, Kyto, or CI 9139 was found in Mexico or the USA in 1980.

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