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Secondary Kill of Adult Male German Cockroaches (Dictyoptera: Blattellidae) Via Cannibalism of Nymphs Fed Toxic Baits

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Five commercially available bait formulations were evaluated for primary kill of 1st- and 2nd-instar German cockroaches, Blattella germanica (L.), and secondary kill of adult male German cockroaches via cannibalism of bait-fed nymphs. Chlorpyrifos and fipronil baits killed 1st- and 2nd-instar cockroaches significantly faster than hydramethylnon, boric acid, or abamectin baits. Secondary kill was observed for all baits tested. Adults that consumed bait-treated nymphs had significantly higher mortality than those fed untreated nymphs. The LT50 values calculated for secondary kill of adult male cockroaches were 1.84 d for adults consuming fipronil-fed nymphs, 6.69 d for hydramethylnon-fed nymphs, 7.21 d for boric acid-fed nymphs, 7.94 d for abamectin-fed nymphs, and 8.48 d for chlorpyrifos-fed nymphs. Adult LT50 values for boric acid, abamectin, and chlorpyrifos were not significantly different. Because secondary kill was observed for all bait formulations tested, it is possible that the importance of toxicant transmission via cannibalism has been underestimated in laboratory and field evaluations.

Keywords: Blattella germanica; cannibalism; secondary kill; toxicant transmission

Document Type: Research Article

Publication date: October 1, 1999

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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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