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System of Nomenclature for Races of Puccinia graminis f. sp. avenae. J. W. Martens, Agriculture Canada, Research Station, 195 Dafoe Road, Winnipeg R3T 2M9; A. P. Roelfs(2), R. I. H. McKenzie(3), P. G. Rothman(4), D. D. Stuthman(5), and P. D. Brown(6). (2)(4)Cereal Rust Laboratory, University of Minnesota, St. Paul 55108; (3)(6)Agriculture Canada, Research Station, 195 Dafoe Road, Winnipeg R3T 2M9; (5)Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul 55108. Phytopathology 69:293-294. Accepted for publication 18 September 1978. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1979. DOI: 10.1094/Phyto-69-293.

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

Additional keywords: Avena barbata, Avena sterilis, oat stem rust, oats.