Abstract
Abstract Insecticides were evaluated for control of soybean looper in Holmes County, MS in a commercial field of maturity group VI soybean planted on 1 Jun in 40-inch row spacing. The soybean was in the R6 growth stage, with mean height of 34 inches and open canopy, and had not received prior insecticide applications. Treatments were 4 rows × 50 ft with 4 replications. The insecticides were applied between 9-11 a.m. on 9 Sep using a hand-held compressed-air sprayer and cone spray pattern at 30 psi in a total volume of 10 gal of water/acre. Temperature at application was 85°F, with sunshine, and wind speed of 3-5 mph. Light rainfall occurred about 3 h after the last insecticide was applied. Treatments were evaluated 4 and 7 DAT using one 6 ft of row drop-cloth sample from each plot. Larval size was recorded as small (1st & 2nd instar), medium (3rd & 4th instar), or large (5th & 6th instar). Data were analyzed using the untreated check to estimate percent control in each replications, with the mean separation procedure performed on data subjected to the arcsine transformation.
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