Effect of Insecticide Applications in Soybeans on Trissolcus basalis (Hymenoptera: Scelionidae)

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Field studies were conducted to determine the effect of the primary insecticides that are applied to control Louisiana soybean insect pests on the survival of an important biological control agent of stink bugs (Hemiptera: Pentatomidae). Adult egg parasitoids, Trissolcus basalis (Wollaston), were affected little by permethrin field applications, but methyl parathion had an adverse but short-lived effect on parasitoid survival. High levels of adult parasitoid mortality were observed only within the first 6 h following methyl parathion application. Neither insecticide affected emergence of parasitoids from their host eggs, suggesting that stink bug eggs provided a barrier to insecticide penetration. However, parasitoids apparently contacted insecticide residues when chewing through host egg shells to emerge, resulting in some mortality after emergence, caused by methyl parathion. The degree of this mortality was affected by three factors: parasitoid developmental stage at time of insecticide application, position of parasitized egg masses in the soybean canopy, and parasitoid gender. Overall, results of this study suggest a general compatibility between a major biological control agent of stink bugs, T. basalis, and insecticidal control of stink bugs and lepidopterous pests in Louisiana soybeans.

Document Type: Research Article

Publication date: August 1, 1989

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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