The Effects of Insecticides on the Behavior of the Green Peach Aphid and Its Transmission of Potato Virus Y1

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Abstract
The effects of insecticides on the behavior of the green peach aphid, Myzus persicae (Sulzer), and its transmission of potato virus Y (PVY) were studied in the greenhouse. After the initial probes, aphids made longer feeding probes on parathion-treated tobacco foliage than on untreated leaves while the opposite was true on DDT-treated foliage. Neither material affected aphid acquisition of PVY but parathion tended to decrease and DDT increase the number of transmissions to treated plants. Several insecticides tested for speed of toxic action on winged green peach aphids, required at least 51-180 min to kill 90% of the aphids 2 hr after application and much longer 3 days later, while aphids can transmit nonpersistent viruses in less than a minute. Winged aphids remained on plants treated with paratnion and phorate longer than on untreated plants, but the contrary with DDT. When applied to filter paper, parathion attracted aphids while DDT had relatively little effect. Viruliferous aphids transmitted PVY slightly more to parathion-treated than to untreated tobacco plants. Aphid dissemination of PVY within cages was greatly reduced when parathion was applied to the virus source plants.

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