Abstract
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.

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