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Susceptibility of the Confused and Red Flour Beetles1 to Anoxia Produced by Helium and Nitrogen at Various Temperatures2

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Investigations were conducted to determine the relative susceptibility of different stages of Tribolium confusum Jacquelin duVal and T, castaneum (Herbst) to 100% helium or nitrogen, The adult stage was the most susceptible, followed by larval, egg, and pupal stages, T, castaneum adults were slightly more susceptible to 100% He or N2 than adults of T, confusum. Helium was comparatively more toxic than nitrogen, especially to the adults at lower relative humidity.

Increasing the relative humidity from 38 to 100% decreased the susceptibility of T. confusum and T. castaneum adults to the gases tested. On the other hand, increasing exposure temperature from 15.6 to 21.1 to 26.7°C resulted in increased susceptibility of beetles to anoxia produced by nitrogen or helium.

Toxicity of 100% He or N2 atmosphere may be due to the combined deleterious effects of anoxia and inert gas narcosis.

Document Type: Research Article

Publication date: February 1, 1972

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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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