Development of Pheidole megacephala (Hymenoptera: Formicidae) Colonies Following Ingestion of Fenoxycarb and Pyriproxyfen

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Laboratory-reared Pheidole megacephala (F.) colonies were fed 2% pyriproxyfen (5umitomo 5-31183) or 2% fenoxycarb, ethyl [2-(4-phenoxyphenoxy)ethyll carbamate, in soybean oil. Queens in colonies treated with pyriproxyfen laid significantly fewer eggs than controls 2 wk after treatment. Oviposition ceased in all pyriproxyfen-treated queens at 6 wk after treatment, with no recovery during the 15 wk of the study. Brood volumes in pyriproxyfen-treated colonies declined after 2 wk because of pupal death. No brood was found after 4 wk. Fenoxycarb-treated queens laid significantly fewer eggs than controls after 2 wk. Fenoxycarb-treated colonies shifted caste differentiation from workers to males at 3 wk after treatment. At 5 wk, 90% of larvae were male; the remaining 10% developed into intercastes.

Document Type: Research Article

Publication date: February 1, 1991

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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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