Abstract
Abstract Three tests were conducted to evaluate the efficacy of selected insecticides against boll weevil and tarnished plant bug in irrigated cotton planted 18 Apr. Plots consisted of 4 rows (40 inch centers) × 50 ft. in all tests. Treatments were arranged in a RCB design with 4 replications. Insecticides were applied on 1, 6, 11, 18, and 21 Jul in all tests. Applications were made with a high clearance sprayer calibrated to deliver 6 gal total spray/acre through TX-8 hollow cone nozzles (2/row) at 48 psi. Treatments were evaluated 4-5 times by examining 50 cotton squares (flower buds) per plot 3-5 DAT for evidence of boll weevil damage. Treatments were evaluated for tarnished plant bug control with a standard 15 inch diam sweep net by counting the number of adults and nymphs in a 25 sweep sample/plot on 25 Jul. No additional foliar insecticides were applied to the plots during this test. The test area received 0.46 inch rainfall on 4 Jul, 0.72 inch rainfall on 9 Jul, 1.6 inches rainfall on 14 Jul, 0.51 inch rainfall on 16 Jul, and 0.46 inch rainfall on 22 Jul. Data from each test were analyzed with ANOVA, and means were separated according to DMRT.
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