Control of Bollworm/Budworm Complex in Mississippi Cotton, Trial III, 1992

Treatments were applied on 14 Aug using a CO2 powered backpack sprayer calibrated to deliver 9.9 gal of finished spray per acre through 8001 nozzle tips at 48 psi. The crop had been planted on a skip row pattern, 2 and 1, on 36 inch rows. The plots, which were located in Madison County, were 6 rows wide by 40 ft long, arranged in a randomized complete block design with 4 replications. Counts were made 3 and 7 DAT by searching the terminal area of 25 plants per plot for larvae; 4 randomly chosen fruiting structures (squares and young bolls) from each plant were examined for larval damage. No rain fell on the plots prior to the 3 DAT sample date. Pretreatment infestation level within the plot area was 12% eggs and 10% small larvae. Of 13 larvae collected from check plots at 3 DAT, 77% were identified as tobacco budworms.