Boll Weevil Susceptibility to Toxaphene, Endrin, and Guthion in Five Alabama Localities1

Publisher Website
Google Scholar
Abstract
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 μg. per gm. of boll weevil; for endrin, from 0.8 to 3.5 μg. per gm; for Guthion, from 0.9 to 2.3 μg. 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.

This publication has 2 references indexed in Scilit: