Field Tests with Several Insecticides for Control of the Pink Bollworm, Boll Weevil, and Bollworm1

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Abstract
Insecticides were evaluated for control of the pink bollworm, Pectinophora gossypiella (Saunders); boll weevil, Anthonomus grandis Boheman; bollworm, Heliothis zea (Boddie); and tobacco budworm, Heliothis virescens (F.) in field-plot tests in the lower Rio Grande Valley of Texas in 1961 and 1962. Of 4 carbamates tested, carbaryl and Bayer 37344 gave the best control of pink bollworm and boll weevil, while Zectran® and Bayer 44646 gave significantly better results against the bollworm-tobacco budworm complex. Imidan®, a phosphorus compound, gave fair control of pink bollworm and boll weevil but was ineffective against the bollworm complex. A standard, dieldrin-DDT mixture, failed to give satisfactory control of boll weevils and bollworm complex in 1 experiment. The chemical definitions of the insecticides with proprietary names mentioned above are: Bayer 37344 (4- (methylthio) -3,5-xylyl methylcarbamate); Bayer 44646 (4-dimethylamino-m-tolyl methylcarbamate) ; Imidan® (O,O-dimethyl S-phthalimidomethyl phosphorodithioate); and Zectran® (4-dimethylamino-3,5-xylyl methylcarbamate).

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