Response of Campoletis perdistinctus and Apanteles marginiventris to Insecticides1234

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Abstract
The relative toxicities of several insecticides sometimes used in cotton-insect control programs were established in laboratory and field-cage tests for adults and cocoons of Apanteles marginiventris (Cresson) and Campoletis perdistinclus (Viereck). In general, A. marginiventris was more susceptible than C. perdistinctus; adults were much more susceptible than cocoons; males were more susceptible than females; higher doses were more toxic and persistent than lower doses; oxygen analogues of azinphosmethyl and malathion were more toxic to adult G. perdistinctus than the parent compounds; increases in the chain length of the dialkyl R groups of azinphosmethyl, methyl parathion, and trichlorfon decreased toxicity; and the residues from ultra low volume (64 oz/acre or less) applications were more toxic and more persistent than the residues from conventional low-volume (more than 64 oz/acre in water) applications. Variations in the response of the parasites to insecticides may help in developing integrated-control programs for cotton insects that includes both chemical and biological control methods.

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