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Epidemiology of barley yellow dwarf virus in ontario and quebec canada in 1982 and 1983


, : Epidemiology of barley yellow dwarf virus in ontario and quebec canada in 1982 and 1983. Canadian Plant Disease Survey 64(1): 21-24

An epidemic of barley yellow dwarf virus (BYDV) occurred in winter wheat and barley crops in most parts of Ontario and Quebec in 1982-83. Infection of winter wheat averaged 50% but up to 100% BYDV infection was evident in barley fields in south-central Ontario. A vector nonspecific strain of the virus was predominant in winter wheat although levels of a Rhopalosiphum padi-specific and a R. maidis-specific strains were also significant. The high incidence of BYDV in winter cereals in the autumn apparently resulted from a large aphid migration in Oct. In the summer of 1983, there was little evidence of transfer of BYDV from the winter cereals to the spring grains in Ontario. In mid-Aug. BYDV appeared rather suddenly in many areas of Quebec, causing some damage to late-seeded fields.

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