Field Tests with Some of the New Insecticides for Control of the Bollworm and a Spider Mite1

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Abstract
Thiodan sprays and dusts at 0.7 pound per acre were as effective as toxaphene-DDT spray for control of the bollworm, Heliothis zea (Boddie), on cotton, but Thiodan spray at 0.5 pound was less effective. Sevin dusts at 2 and 1.6 pounds per acre were more effective than sprays at 1.0 and 1.5 pounds or than toxaphene DDT spray. While Sevin was being used, heavy infestations of the desert spider mite Tetranychus desertorum (Banks) developed. Parathion, Chipman R-6199, Guthion, and Diazinon at 0.25 pound and Hercules AC-528 at 0.5 pound per acre were equally effective against the spider mite. Kelthane at 1 pound, ethion and Trithion at 0.5 pound, and Monsanto CP-7769 (hexaethyl (ethylthiomethylidyne) triphosphonate) at 0.25 pound were more effective than parathion at 0.25 pound per acre.