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Chemosterilant Effects of Tepa, Apholate, and Metepa on the Alfalfa Weevil

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Field-collected male Hypera postica (Gyllenhal) were sterilized by immersion in aqueous solutions from 0.5 to 2% of tepa, apholate, and metepa. Tepa at 0.5% most effectively sterilized both sexes. Egg viability was reduced to less than 10% for 26 days by confining untreated females with males immersed in 0.125% tepa. Maximum male sterility occurred approximately 9–12 days after immersion in 0.5–0.125% tepa; fertility was gradually regained. Duration of the sterility effect in males appeared related to dosage. Metepa and apholate immersion of males significantly reduced egg hatch, but were not so effective as tepa. Immersion of females in tepa and apholate resulted in cessation of egg production, but metepa was much less effective in reducing egg viability or production. Toxic effects of immersion treatment to males and females were not great and tepa-immersed males (0.5%) were competitive with normal males for mates. Residues of tepa and metepa on alfalfa foliage fed to males significantly reduced egg viability. Longevity of tepa-fed males was significantly reduced.

Document Type: Research Article

Publication date: December 16, 1968

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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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