Abstract
The systemic insecticide Thimet, O, O-diethyl S-(ethylthiomethyl) phosphorodithioate, was formulated at the rate of3 1/3 pounds actual in 250 pounds of 12-12-12 granular fertilizer and applied in bands at this rate per acre at planting of cut Red Pontiac seed potatoes. To insure sufficient transmission of virus Y, the green peach aphid,Myzus persicae, was cultured on the potato selection ND530, a virus Y carrier, in the greenhouse. Aphid-infested leaves were taken to the plot June 17 and 24, and July 3, and placed on rows of ND530 growing between and on the outsides of the Red Pontiac rows. The aster yellows virus, causing purple-top wilt, was transmitted by a natural infestation of the 6-spotted leafhopper,Macrosteles fascifrons. The use of Thimet in this manner was not effective in reducing the incidence of virus Y but there was a significant decrease in the incidence of purple-top wilt.
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