Calonectria nivalis Causes Scab in the Pacific Northwest. D. A. Inglis, Graduate Research Assistant, Department of Plant Pathology, Washington State University, Pullman 99164. R. J. Cook, Research Plant Pathologist, Agricultural Research Service, U.S. Department of Agriculture, Pullman. Plant Dis. 65:923-924. Accepted for publication 10 March 1981. 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, 1981. DOI: 10.1094/PD-65-923.

Calonectria nivalis caused scab in wheat fields throughout Skagit County in northwestern Washington in 1980. The disease has not been reported previously in the Pacific Northwest, although the fungus has been known for a long time in the region. The unusually high number of rainy and cloudy days in northwestern Washington during May and June probably favored the disease.

Keyword(s): Fusarium nivale, Micronectriella nivalis, Triticum aestivum.