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

Treatments were applied on 20 Jul using a CO2 powered backpack sprayer calibrated to deliver 9.9 gal of finished spray per acre through 8001 nozzle tips at 40 psi. The plots, which were located in Warren County, were 8 rows wide (38 inch on center) by 50 ft long, arranged in a randomized complete block 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 squares from each plant were examined for damage determination. A total of 0.2 inches of rain fell on the plots approximately 60 hr posttreatment. Pretreatment infestation level within the test area was 18% eggs and 26% small larvae. Of 25 larvae collected from check plots and adjacent untreated areas at 3 DAT, 92% were tobacco budworms.