Evaluation of Karate for Management of Arthropods in Soybean, 1992

Abstract

Abstract The experiment was conducted at the Texas A&M University Agricultural Research and Extension Center, Beaumont. The experimental design was a randomized complete block with 5 treatments and 4 replications. Soil type was a Midland silty clay loam. Plot size was 60 ft × 21 ft (8 rows with a 32-inch row spacing). Soybeans were planted 22 May at about 10 seeds/ft and plots were treated with 2 pt Dual and 2A pt Scepter/acre in a finished spray volume of 20 gal/acre. Seedlings emerged 26 May. Insecticide treatments were applied (when soybeans were in R5 and Lepidoptera defoliator populations were increasing) 10 Sep to the middle 2 rows of each plot with a 4-nozzle hand-held boom sprayer equipped with 800067 tips in a final spray volume of 16.7 gal/acre. The propellant was CO2 at 20 psi. Applications were made during calm, clear conditions. No rain fell for 4 days after application of treatments; however, for the entire sampling period (8 Sep-15 Oct) 0.77 inches of rain was recorded. Two days before and 1, 5, 7, 15, 21, 28, and 35 days after application of treatments, 9 ft of row in each plot were sampled with a vertical beat sheet. Samples were placed in plastic bags and refrigerated. Contents were examined and arthropods identified and counted. The middle 2 rows of each plot were harvested at maturity with a small plot combine. Yields were adjusted to 13% moisture. Insect data were transformed by Vx + 0.5 and all data were analyzed using ANOVA and where appropriate DMRT.