Abstract
Abstract Insecticides were evaluated for efficacy in controlling soybean loopers in Holmes County, MS, in a commercial field of maturity group VII soybean planted 3 May in 20-inch row spacing. At the time of application the soybean was in the R6 growth stage, was 47 inches tall with closed canopy, and had not received prior insecticide applications. Treatment plots were 4 rows by 50 ft, established in a randomized complete block design with 4 replications. The insecticides were applied 21 Sep (4-7 p.m.) using a hand-held compressed-air sprayer with cone spray pattern, calibrated to apply 15 gallons/acre at 30 psi. Temperature at application was 88.5°F, with sunshine, and wind speed was 0-2 mph. Treatments were evaluated 2 (36 h) and 6 DAT by cutting and removing plants from one 6 ft section of row per plot, and immediately visually searching for larvae (2 DAT) or larvae and pupae (6 DAT). Pretreatment samples indicated that when the plants were cut and removed from the field, loopers clung to the foliage, and less than one looper per sample was dislodged.
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