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Sterilization of Callosobruchus chinensis1 by Hexamethylphosphorothioic Triamide2

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Male and female adults and male pupae of the azuki bean weevil, Callosobruchus chinensis (L.) , were sterilized by applying hexamethylphosphorothioic triamide (thiohempa) topically to the dorsal side of the insects. The female pupae were only slightly susceptible. The median oviposition-inhibiting doses for the adult insects were 22.383 µg per ♀, 45.952 µg per ♂, and 15.737 µg per weevil; the median hatch-inhibiting doses were 8.291 µg per ♀, 9.156 µg per ♂, and 3.487 µg per weevil; the LD50 values were 36.399 µg per ♀ and 21.733 µg per ♂. For the pupal stages, the median hatch-inhibiting doses were 9.039 µg per ♂ and 6.565 µg per pupa. Thiohempa was 3 times as effective as the closely related chemosterilant hempa when adult females were treated, it was 16 times as effective when adult males were treated, and it was 4 times as effective when adults of both sexes were treated.

Document Type: Research Article

Publication date: October 1, 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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