Tests of Insecticides for Control of Cotton Insects During 19501

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Abstract
In a split-block randomized expt., sprays of aldrin, dieldrin and toxaphene were more toxic to thrips than dusts. Aldrin and dieldrin sprays at 0.08 and 0.09 lb./acre, were more effective than toxaphene at 0.73 lb./acre. Toxaphene, toxaphene-DDT and gamma benzene hexachloride-DDT dusts were equally effective for boll weevil and bollworm. Toxaphene-DDT spray was as effective as dusts. In laboratory tests, toxaphene-DDT spray was more effective than toxaphene spray against boll weevil, particularly at the high levels of mortality. In a randomized block expt. with a heavy bollworm infestation, toxaphene and 3-5-40 dusts were equally effective and both were better than dieldrin dust, dieldrin spray, toxaphene spray or aldrin spray. In 4 tests with plats of 1-40 acres, sprays applied either with a tractor or an airplane were effective for boll weevil and bollworm control. In the tests where 6-12 applications were required, the avg. net gains in yields over the check plats were 672-1223 lbs. seed cotton per acre. Against spider mites, aramite was more effective than 3 other S compounds tested.

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