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Disease Note

First Report of Oat Cyst Nematode (Heterodera avenae) on Barley in Idaho. S. L. Hafez, University of Idaho, Southwest Idaho Research and Extension Center, Parma 83660. A. M. Golden, Plant Protection Institute, USDA, Beltsville, MD 20705. Plant Dis. 69:360. Accepted for publication 26 November 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-360a.

The oat cyst nematode (Heterodera avenae Wollenweber) was detected in two soil samples from two different barley fields near Parker in Fremont County, Idaho. The samples were collected after harvest as a routine check in preparation for a potato crop the following growing season. Each field had been in barley and potato rotation for several years. Soil samples were received at the nematode clinic laboratory and examined by the first author. Cyst and larvae were identified as the oat cyst nematode and were sent to the second author for confirmation. The oat cyst nematode occurs worldwide and frequently causes economic losses in susceptible cereals. This pest was first reported in the United States in Oregon and has recently been discovered in eastern Washington. This is the first report of the nematode in Idaho.