Abstract
A formula system for describing Puccinia graminis f. sp. avenae avirulence/virulence combinations of Avena sativa based on 9 single-gene backcross differential lines (including 2 new genes for resistance) and 1 undefined genotype is proposed for international use. Thirty different avirulence/virulence combinations were identified in P. graminis f. sp. avenae in North America with this group of differential lines.

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