COTTON APHID (HOMOPTERA, APHIDIDAE) - EFFECT OF IN-FURROW INSECTICIDES ON PESTICIDE RESISTANCE

A 2-yr study of the effect of in-furrow application of aldicarb, disul foton, carbofuran, and acephate on the level or frequency of resistanc e in the cotton aphid, Aphis gossypii Glover, revealed an increase in tolerance of survivors to bifenthrin (pyrethroid) and endosulfan (CHHC ), two commonly used aphicides. With the exception of a low dose of ac ephate, all granular insecticides applied at planting increased the to lerance of surviving field-collected aphids and their offspring to bot h of these pesticides. Because alternative control measures may contri bute more to the resistance problem than the use of granular insectici des at planting, the use of granular insecticides is still recommended as one of the steps to be taken in resistance management.