Abstract
A 2-yr study of the effect of in-furrow application of aldicarb, disulfoton, carbofuran, and acephate on the level or frequency of resistance 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 acephate, all granular insecticides applied at planting increased the tolerance of surviving field-collected aphids and their offspring to both of these pesticides. Because alternative control measures may contribute more to the resistance problem than the use of granular insecticides at planting, the use of granular insecticides is still recommended as one of the steps to be taken in resistance management.
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