Sterility Induced by Tepa in the Boll Weevil1 : Effective Dose and Permanency, Gonadal Changes, and Biological Turnover of Labeled Compound2

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The male boll weevil, Anthonomus grandis Boheman, was sterilized with tepa, cither by feeding 1500 ppm in the diet for 2 days or by an injection of 3.5 g. Lower levels produced transitory sterilization. At the effective levels, mortality was significant. A recovery of fertility occurred about 5 days after treatment at the 1.5-g level. This recovery was less marked with an artificial diet than with cotton buds. In a study of single pairs 12 of 27 males, surviving treatment at the 1.0-g level, regained fertility within 36 days. Decreases in the size of the testes and changes in morphology and cytology occurred. The radioactivity of insects treated with C14-labeled tepa was decreased by half in 6—48 hours, depending on the diet, but 10—20% was retained for at least 10 days. No differences related to posttreatment diet were observed. Nitric acid was employed for digestion of insect tissue prior to C14 gas-flow counting. Conditions arc described for reproducible and near-quantitative counting of the isotope.

Document Type: Research Article

Publication date: February 1, 1967

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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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