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Integrated Pest Management Studies of the Cotton Aphid, Aphis Gossypii Glover.

Studies were conducted to characterize insecticide resistance and to document aspects of the basic biology of the cotton aphid, Aphis qossypii Glover, that were related to recommendations for integrated pest management. Laboratory, greenhouse, and field techniques were employed in these investigations. Significant levels of resistance were demonstrated to four recommended insecticide classes. Resistance appeared more stable over time for the organophosphate insecticide (chlorpyrifos) than for the organochlorine (endosulfan) and pyrethroid (bifenthrin) insecticide tested. The organophosphate resistance ratio of a clonal line of the cotton aphid was significant, but relatively low. Carboxylesterases, as studied by spectrophotometric and electrophoretic techniques, appeared involved as a mechanism of organophosphate resistance. Stable organophosphate resistance caused no reproductive disadvantage in the cotton aphid. Total reproduction of susceptible and resistant aphids was not