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Influence of Carbon Dioxide Anesthesia on Chlorpyrifos Toxicity in the German Cockroach (Dictyoptera: Blattellidae)

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Abstract:

Insecticide-susceptible (Orlando normal) and multi-insecticide-resistant (Village Green) adult male Kennan cockroaches, Batella germanica (L.), were exposed to carbon dioxide (CO2) gas in either varying durations or multiple exposures of fixed duration followed by topical treatnent with acetone or chlorpyrifos (LD25) to evaluate the effect of CO2 anesthesia on chlorpyrifos toxicity. CO2 anesthesia did not increase chlorpyrifos toxicity in either strain regardless of exposure duration up to 1 h. However, multiple CO2-induced knockdowns alone caused mortality and increased chlorpyrifos toxicity. Twenty-four-hour weight loss was independent of CO2 duration exposure by strain. Village Green and Orlando cockroaches lost 5.3 and 7.6% of their weight in 24 h when treated with acetone and 10.5 and 12.8% when treated with chlorpyrifos, respectively. Conversely, 0- and 24-h weight loss increased with increasing CO2-induced knockdowns regardless of strain or topical treatment. Based on these results, CO2 used either once of limited duration (≤15 min) or multiple times of short duration, not to exceed four total knockdowns, does not increase chlorpyrifos toxicity in the adult male German cockroach.

Document Type: Research Article

Publication date: June 1, 1994

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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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