PREVALENCE OF BARLEY YELLOW DWARF ON CEREALS IN NEW BRUNSWICK IN 1970, AND EFFECT OF THE VIRUS ON FORAGE YIELD OF OATS

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Abstract
Barley yellow dwarf virus was prevalent on a large acreage of late-seeded cereals in the Florenceville and Fredericton areas of New Brunswick in 1970. Areas of diseased plants within fields were successfully located by aerial surveying. The virus, isolated from samples, was transmitted most efficiently by Rhopalosiphum padi and less efficiently by Macrosiphum avenae, Schizaphis graminum and Acyrthosiphon dirhodum, but rarely by R. maidis, and on this basis is a nonspecific strain of barley yellow dwarf virus. The weight of dry matter per ha from diseased forage oats (O.A. 123-1) was 63.1% less than that from healthy oats. The percentage of dry matter for diseased plants averaged 6% less than for healthy plants.

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