Abstract
Abstract A field evaluation of insecticides to control boll weevil and Heliothis spp. larvae on cotton was conducted on sandy loam soil at the Plant Breeding Unit of Auburn University, Tallassee, AL. Cotton was planted on 24 May in 40-inch rows. Eleven treatments were replicated 5 times in a randomized complete block design. Plots were 9 rows × 75 ft with 25-ft alleys between blocks. Insecticides were applied with a high-clearance sprayer at the rate of 8.8 gal of spray per acre (3.5 mph, 50 psi, 2 Teejet TX6 nozzles/row). Foliar applications were made on 1, 12, 15, 20, and 25 Aug, and 5, 10, 15, 19, and 24 Sep. Boll weevil damage was estimated by examining 25 squares collected at random in each plot. Heliothis damage and larval numbers were estimated by examining 25 randomly selected plant terminals in each plot. Data were taken from 2 of the middle three rows of each plot 2 to 3 days following treatment. Due to drought conditions, cotton was planted late and maturity was late.
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