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Six insecticide treatments were evaluated at the Macon Ridge Branch of the Northeast Research Station, Winnsboro, LA, to determine their efficacy in controlling the bollworm/tobacco budworm complex and boll weevils. Cotton was planted 18 Jun in plots consisting of 4 rows (40 inch centers) × 50 ft. Treatments were arranged in a RCBD with 4 replications. Treatments were applied with a high clearance sprayer calibrated to deliver 6 gal total spray/acre through Teejet X-8 hollow cone nozzles (2/row) at 46 psi. Insecticides were applied on 22, 26 Aug and 1 Sep against established populations of bollworms, tobacco budworms (primarily tobacco budworms) and boll weevils. Efficacy of the various treatments against these species was determined on 25, 31 Aug and 7 Sep by examining 50 squares/plot for evidence of feeding damage. Also numbers of larvae per 50 squares were recorded for the bollworm/tobacco budworm complex. The plots were mechanically harvested on 25 Oct to determine seed cotton yields. The test area received 0.57 and 0.20 inches rainfall on 1 and 6 Sep, respectively.

Evaluation of Insecticide Combinations Against Late Season Populations of Bollworms, Tobacco Budworms and Boll Weevils, 1994