Status of Boll Weevil Resistance to Insecticides in Louisiana During 19611

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Abstract:

Expansion of the areas in Louisiana infested with chlorinated hydrocarbon resistant boll weevils (Anthonomus grandis Boheman) has occurred yearly since 1955, with the result that all cotton-producing areas of the State are now affected. Considerable reversion to susceptibility to the chlorinated hydrocarbon insecticides has occurred in field populations, but resistance remains at a level sufficiently great to prevent effective control with these insecticides. After .5 to 6 years of intensive use of organic phosphorus insecticides or toxaphene-DDT mixtures in certain areas, there has been no measurable change in response of the boll weevil to these insecticides. Under laboratory conditions, a 10- to 12-fold increase in the LD-50 of a boll weevil culture to toxaphene-DDT mixture was obtained in 22 generations.

Document Type: Research Article

Publication date: December 1, 1962

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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