Abstract
Abstract A field evaluation of insecticides for control of Heliothis spp. larvae on cotton was conducted at the Auburn University Plant Breeding Unit, Tallassee, Ala. Cotton was planted on 24 Apr in 40-inch rows. Eleven treatments were replicated 4 times in randomized complete block design. Plots were 9 rows × 75 ft with 30-ft alleys between blocks and 3 rows between treatments. Insecticides were applied with a high-clearance sprayer at the rate of 8.2 gal/acre (3.5 mph, 50 psi, 2 Teejet TX6 nozzles/row). Foliar applications were made on 19, 25, and 28 Aug. San 4141, San 4151, or San 4151 + Fundal treatments on 19 Aug were changed to Ammo, 0.04 lb (AI)/acre, on 25 and 28 Aug. Heliothis damage, egg numbers, and larval numbers were determined by examining 25 randomly selected plant terminals located in the middle 3 rows in each plot 2 to 3 days posttreatment. Yield data were taken by machine harvesting of 2 of the middle 3 rows of each plot.
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