Chemical Control of Boll Weevils in Alabama, 1984

A field evaluation of insecticides to control boll weevil was conducted on sandy loam soil at the Plant Breeding Unit of Auburn University, Tallassee, AL. Cotton was planted on 23 Apr in 40 inch rows. Four replicates of 8 treatments were applied in a randomized complete block design. Plots were 9 rows x 75 ft with 25-ft alleys between blocks. Insecticides were applied with a high-clearance sprayer at the rate of 11.5 gal spray per acre (3.5 mph, 50 psi, 2 Teejet™ TX6 80° nozzles/row). Plots were treated for weevils on 19 and 24 Jul, and 7, 10, 15, 20, and 27 Aug. The ca. 5-day spray interval was interrupted from 24 Jul to 7 Aug due to wet weather. Plots were oversprayed on the same dates with Bolstar to suppress bollworms. Damage was estimated by examining 25 squares collected at random from the middle 3 rows of each plot.