Evaluation of Insecticides for Control of Tarnished Plantbugs on Cotton in Mississippi, 1994

This evaluation was made on Coker 312 cotton planted as buffer rows for a transgenic cotton trial which had received little insecticidal input throughout the season. Pretreatment assessment of the plantbug infestation was made by sampling 2 outside rows of 9 randomly chosen plots within the test site immediately prior to insecticide application by making 20 sweeps with a 15 inch diameter sweep net. The test was applied 30 Aug under the following conditions: 0-2.3 mph wind, 92°F, 53% RH, and 50% cloud cover. Statistical design was randomized complete block with 3 replications. Plots were 8 rows (38 inch centers) wide and 35 ft long. Applications were made with a high clearance plot sprayer equipped with a compressed air spray system utilizing a flat boom with TX4, hollow cone nozzles spaced at 19 inches traveling at 4 mph. Volumetric application rate was 5 gpa except for the Danitol and VI0009 treatments which were applied at 20 gpa by reducing tractor speed. Post treatment sampling was made 3 DAT by 20 sweeps with a 15 inch sweep net in each pair of the center 4 rows of each plot.