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Efficacy of two insecticide applications, applied either as two standard (low) rates or as one standard followed by one high rate, was evaluated for control ot bollworm on Virginia cotton. ‘DPL 51’ cotton was planted 10 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 10 gpa at 31 psi through one TX10 hollow cone nozzle over the top of each of the two center rows of each plot. All applications were applied at egg threshold (based on the presence of 10 or more boll-worm eggs per 100 plant terminals, or 2 or more per 100 fruit, i.e., squares or bolls) and again after 5 days. A RCB experimental design was used with 4 replicates; plots were 4 rows by 40 ft. Boll damage was 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 (80 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 Insecticide Rates and Application Schedules for Control of Bollworm on Cotton, 1996