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Relative Tolerance of Contemporary Oat Cultivars to Currently Prevalent Races of Crown Rust¹

We tested about 100 contemporary oat (Avena sativa L.) cultivars, all visually rated as susceptible to crown rust (Puccinia coronata Cda. var. avenae Fraser and Led.) race 326, with severe field epiphytotics of this race. Eleven eultivars were then selected for more intensive testing with races 216 and 264, as well as with race 326. Yield and seed weight data showed that some cultivars (‘Clintland 64,’ ‘Jaycee,’ ‘Tippecanoe,’ and ‘Tyler’) were damaged as severely by race 326 as was the old highly susceptible ‘Clinton,’ while others (‘Kota,’ ‘Nodaway,’ and ‘Nodaway 70’) yielded almost as much as the resistant check.

Key Words: Puccinia coronata • Avena sativa • Disease resistance

² Research Technician and Pathologist, respectively, Crops Research Division, Agricultural Research Services, U.S. Department of Agriculture.

Received for publication July 7, 1970.