Rearing and Treating Successive Generations of Boll Weevils1

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In studies of boll weevil (Anthonomus grandis Boh.) resistance to chlorinated hydrocarbon insecticides, 10 generations were reared from September 1956 to September 1958 and 4 to 6 generations were treated topically with insecticides. There was no indication of reversion to susceptibility in the untreated strains when tested with endrin. Endrin applied to resistant and susceptible strains increased the LD-50 and LD-90, and gave some changes in slope of lines. A mixture of equal parts of endrin and Gut ionĀ® (O,O-diethyl S-(4-oxo-3H-1,2,3-benzotriazine-3-methyl) phosphorodithioate) and Gut ion alone gave no changes in LD-50, LD-90, or slope. However, this does not prove that resistance will not develop with continued selection in large populations of boll weevils.

Document Type: Research Article

Publication date: August 1, 1959

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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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