Occurrence and Virulence of Puccinia recondita in Minnesota in 1982 and 1983. D. V. McVey, Research Plant Pathologist, Cereal Rust Laboratory, USDA-ARS, St. Paul, MN 55108. K. Hamilton, Research Technician, Cereal Rust Laboratory, USDA-ARS, St. Paul, MN 55108. Plant Dis. 69:404-405. Accepted for publication 23 October 1984. 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, 1985. DOI: 10.1094/PD-69-404.

Twenty-five avirulent/virulent combinations (races) of leaf rust (Puccinia recondita) were identified on 12 near-isogenic Lr differential lines from 334 isolates in 1982 and on 19 races from 144 isolates in 1983 collected in a leaf rust survey conducted in Minnesota. Lines with genes Lr16 and Lr19 were resistant to all isolates, whereas lines with Lr9 and Lr24 were resistant to most isolates.