Laboratory experiments were conducted in 1956 and 1957 to determine the susceptibility of the boll weevil Anthonomus grandis Boh., to toxaphene endrin, and Guthion® (O,-O- dimethyl S-( 4-oxo-1,2,3,-benzotriazin-3-( 4H)-ylmethyl) phosphorodithioate) in five Alabama localities. The technical insecticides were dissolved in acetone and applied topically to 2-day-old weevils reared from cotton squares. :Mortalities were determined at the end of 72 hours. Approximately 25,000 weevils were used in the experiments. During 1957, LD-50 values varied among populations from different localities as follows: for toxaphene, from] 2.5 to 61.8 pg. per gm. of boll weevil; for endrin, from 0.8 to 3.5 pg. per gm; for Guthion, from 0.9 to 2.3 pg. per gm. There was no evidence of acute resistance of the boll weevil from any of five localities to any insecticide tested. Mortality variations between times of year and between the two years were as great as among locality groups.
Document Type: Research Article
Publication date: April 1, 1960
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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.