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Different application schedules with insecticides at different rates were evaluated for control of bollworm in VA. ‘Sure-Grow 501’ cotton was planted 1 May at the Virginia Tech Tidewater Agric. Res. &amp; Ext. Ctr., Suffolk, VA, using a 36-inch row spacing. All treatments were applied with a CO2 pressurized backpack sprayer calibrated to deliver 14.5 gpa at 50 psi through three, D2-13 disc-core hollow cone nozzles per row, one over the top of the row and one on each side. Four application schedule/insecticide rate combinations were tested: 1)3 applications at the standard rate, the 1 st at the egg threshold, the 2nd in 5d, and the 3rd in l0d; 2) 2 applications at the standard rate, the 1st at the egg threshold, the 2nd in 5d; 3) 2 applications, the 1st at the egg threshold using 1.6x the standard rate, and the 2nd in 5d using the standard rate; 4) 1 application at the egg threshold using 1.6x the standard rate. Egg threshold application was based on the presence of 10 or more bollworm eggs per 100 plant terminals, or 2 or more per 100 fruil (squares or bolls). A RCB experimental design was used with 4 replicates; plots were 6 rows by 30 ft. Boll damage and bollworm numbers were determined by sampling 25 randomly selected bolls per plot. Samples were taken at roughly weekly intervals after the occurrence of the egg threshold. Yield was determined by harvesting the 2 center rows of each plot (60 row ft per plot) using a commercial 2-row John Deere cotton combine. Lint values were calculated as 37% of total plot weights, assuming 63% was seed and trash. Data were analyzed using ANOVA and LSD statistical procedures.

Different Application Schedules and Insecticide Rates for Control of Bollworm in Virginia Cotton. 1995