Responses of Striped Earwigs Following Applications of Heptachlor and Mirex, and Predator-Prey Relationships Between Imported Fire Ants and Striped Earwigs1

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Field populations of striped earwigs Labidura riparia (Pallas) in Baton Rouge arc resistant to chlorinated hydrocarbon insecticides and are not killed by these chemicals at rates recommended for control of imported fire ants, Solenapsis saevissima richteri Forel. Striped earwig populations developed to a significant higher level in suburban yards treated with 10% granular heptachlor than in untreated yards. Heptachlor-treated field plots covering 2800 square feet developed higher populations of striped earwigs than did either mirex-treated (0.025% bait) or untreated field plots of equal size. Heptachlortreated field plots situated 100 or more feet from suburban yards had significantly fewer earwigs than did heptachlor-treated suburban yards. Imported lire ants and thief ants, S. molesta (Say), were the only predators observed feeding on eggs of the striped earwig when eggs were exposed overnight in 0.5-dr vials situated in untreated field plots. Within heptachlor-treated field plots where fire ant populations were reduced to a minimum, cannibalism by 5th and 6th instar and adult earwigs on eggs of their own species was frequently observed.

Document Type: Research Article

Publication date: June 1, 1969

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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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