Abstract
Abstract Two trials to evaluate the efficacy of chlorpyrifos-mefhyl to control TPB were conducted in cotton planted 17 May on the UA Cotton Branch Experiment Station in Marianna, AR. The 8 row (38 inch centers) X 50 ft plots were separated by 2 rows of buffer zone. Treatments were arranged in a RCBD with 3 replications. In Trial I insecticides were applied 21 Jul using a 2-row, CO2-charged back pack sprayer calibrated to deliver 10 gpa at 20 psi with 1, TX6 nozzle per row. In Trial II insecticides were applied 4 Aug using a 4-row CO2-charged back pack sprayer calibrated to deliver 13 gpa at 20 psi with 1, TJ-60 8002vs nozzle per row. For each study, 3 organdy sleeve cages, 9 inches diam by 22 inches long, had been secured to individual plants in each plot by tying the lower end of each cage around the plant ca 1 ft from the terminal with twist ties. The cages were rolled down to the tie and covered with aluminum foil. Following application the foil was removed, the cage pulled up, and 5 TPB were placed into each cage. Cage tops were secured with twist ties. Insects had been collected by sweep net on blooming mustard immediately prior to testing and held in 15 ml plastic vials (5/vial) on ice. After 72 hr, plants were cut below the cage and taken to the laboratory where TPB mortality was determined.
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