Insecticide interference with Microplitis demolitor (Hymenoptera: Braconidae) parasitization of Heliothis zea (Lepidoptera: Noctuidae)
1987
Culin, J.D. | Dubose, W.P. III.
Heliothis zea (Boddie) larvae were fed untreated cotton foliage or foliage treated with chlordimeform, methyl parathion, or fenvalerate. Foliage was allowed to age until at least 80% of the larvae placed on foliage for 24 h survived. At the time half were exposed to mated Microplitis demolitor Wilkinson females. Larvae were monitored until H. zea death or pupation or parasitoid pupation occurred. None of the insecticides had significant effects on the survival of unparasitized versus parasitized hosts, or on M. demolitor developmental time. Unparasitized host larvae fed foliage from any of the insecticide treatments had significantly lower survival rates than those fed untreated foliage. All insecticide treatments significantly reduced the percentage of parasitized hosts surviving to parasitoid pupation. Methyl parathion had the most deleterious effect on M. demolitor development. Implications for integrated management programs are discussed.
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