Leptosphaeria maculans on Cabbage in Wisconsin. J. M. Bonman, Western Washington Research and Extension Center, Puyallup, WA 98371. P. A. Delwiche, University of Wisconsin, Madison 53706; R. L. Gabrielson, Western Washington Research and Extension Center, Puyallup, WA 98371; P. H. Williams, University of Wisconsin, Madison 53706. Plant Dis. 64:326. Accepted for publication 28 September 1979. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-326.

Leptosphaeria maculans, the perfect stage of the cabbage blackleg pathogen, Phoma lingam, was found for the first time in the commercial cabbage-growing region of the midwestern United States. Single-ascospore isolates were highly pathogenic to cabbage seedlings.