Oral Toxicity of Chlordane, Hydramethylnon, and Imidacloprid to Free-Foraging Workers of Camponotus pennsylvanicus (Hymenoptera: Formicidae)

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The oral toxicity of the delayed-action insecticide hydramethylnon, in contrast to the acute toxins chlordane and imidacloprid, was evaluated in free-foraging workers of the black carpenter ant, Camponotus pennsylvanicus (DeGeer), gathering insecticide-laced, sugar-milk baits. Hydramethylnon was slower acting than either chlordane or imidacloprid. When workers fed upon 500-ppm baits, hydramethylnon killed ants significantly more slowly (LT50 [95% CL] = 12.7 [12.5-12.9] d) than did chlordane (1.3 [1.1-1.4] d) or imidacloprid (0.3 [0.1-0.5] d). All toxicants were transferred via trophallaxis (i.e., indirect exposure). In ants exposed to a single forager that fed upon a 500-ppm bait (i.e., the donor ant), hydramethylnon caused death significantly more slowly (LT50 [95% CL] = 12.2 [11.9-12.4] d) than did chlordane (4.1 [3.8-4.4] d) or imidacloprid (0.9 [0.8-1.0] d). In both direct and indirect exposures, significant concentration-dependent time delays before mortality were observed with each toxin. Donor ants in indirect exposures survived after gathering and transferring sugar-milk bait laced with chlordane or hydramethylnon but did not survive their exposure to imidacloprid. On the basis of these and other analyses, we identify delayed-action toxins suitable for carpenter ant baits.

Document Type: Research Article

Publication date: December 1, 1993

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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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