Green Peach Aphids and the Spread of Beet Western Yellows Virus in the Northwest12

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Abstract
The relationship between the number of green peach aphids, Mysus persieae (Sulzer), and the spread of beet western yellows virus was studied in 4 areas of the North-west where sugar beets are grown. No direct relationship was found between incidence of the disease and size of the aphid population. In the Yakima Valley, infection was higher in beet fields situated near drainage ditches, where small numbers of aphids in their summer form pass the winter on weed reservoirs of the virus, than in fields near peach orchards. The aphids were 25 times more abundant in fields near the peach orchards where aphids over winter in the egg stage. Early infection and a longer growing season (such as occur near Walla Walla, Washington) appear to be the reasons for greater incidence of beet western yellows virus.

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