A Seasonal Study of Diapause, Reproductive Activity and Seasonal Tolerance to Insecticides in the Boll Weevil1

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A seasonal study of reproductive activity, incidence of diapause and seasonal tolerance to toxaphene and Guthion® (O, O- dimethyl S-(4-oxo-3H-l,2,3-benzotriazine-3-methyl) phosphorodithioate) in the boll weevil was conducted in four cotton fields in central Texas. Diapausing weevils were first found in the various fields during the period from late July through August. Once diapausing weevils were found in a field, they occurred in all subsequent collections from the field. Reproductive activity was high from June until the onset of diapause. One peak of reproductive activity occurred in September on regrowth cotton. Overwintered weevils that emerged early in the season with fat content over 10% of the dry weight were harder to kill with toxaphene than weevils of the current season collected during June and early July. Seasonal tolerance to toxaphene of up to 100-fold occurred with the onset of diapause in the populations. No evidence of seasonal tolerance to Guthion was found.

Document Type: Research Article

Publication date: February 1, 1960

More about this publication?
  • 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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