Status of the Barley Yellow Dwarf Problem of Winter Wheat in Eastern Washington. S. D. Wyatt, Associate Professor, Department of Plant Pathology, Washington State University, Pullman 99164-6430. L. J. Seybert, and G. Mink. Former Graduate Student, Department of Plant Pathology, Washington State University, Pullman 99164-6430, and Professor, Department of Plant Pathology, Washington State University, Prosser 99350. Plant Dis. 72:110-113. Accepted for publication 28 August 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0110.

In the 14 eastern counties of Washington, barley yellow dwarf virus (BYDV) infected about 20% of winter wheat in the 3 yr 1982–1984. High disease incidence was associated with geographical location and planting date. The highest disease incidence was associated with irrigated areas that support the aphid vectors during the summer and with early planting dates. The predominant isolate of BYDV is vector-nonspecific and PAV-like.