EVALUATION OF VARIOUS INSECTICIDES APPLIED AS FOLIAR SPRAYS FOR TARNISHED PLANT BUG CONTROL, 1999

‘DPL 33B’ cotton was planted in a 10-acre field on 20 Apr. The field was divided after emergence into plots that were 16 rows wide and 70 ft long. An RCD design was used with four replications per treatment. Insecticide treatments were applied using a C02-powered spray system mounted on a John Deere 6000 Hicycle. The spray boom was equipped with TX 6 spray nozzles spaced at 20-inch intervals. The spray system was calibrated to deliver 5 gpa at 40 psi. Although slow to increase during the growing season, populations of adult and nymph TPB were sampled weekly using the sweep net and drop cloth. Treatment dates of each insecticide were 1, 8, 13, 21, and 28 Jul. TPB numbers from all treatment dates were averaged. All data were analyzed by ANOVA, and treatment means were separated using least significant differences (LSD, (P = 0.05). The test was terminated on 1 Aug due to the boll weevil eradication program.