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Abstract
Sublethal effects of insecticides on the parasitoid Aphytis melinus DeBach were investigated. Longevity, daily rate of progeny production per female, and size and sex ratio of offspring were measured for parasitoids exposed to rates near the LC50’s of carbaryl, chlorpyrifos, dimethoate, malathion, and methidathion. Survivors of the exposure to carbaryl exhibited no significant sublethal effects. Exposure to each of the organophosphorous materials reduced longevity by 73-85% and temporarily depressed progeny production. Chlorpyrifos also shifted the sex ratio of offspring toward more males. The strength and variability of sublethal effects found in this and other studies indicate that sublethal effects must be considered to evaluate accurately the selectivity of pesticides in favor of parasitoids.
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