Control of Stink Bugs and Velvetbean Caterpillars on Georgia Soybeans, 1994

Abstract

Abstract The efficacy of 14 insecticides for control of velvetbean caterpillars and stink bugs was evaluated at the University of Georgia Coastal Plain Experiment Station, Tifton, GA. The insecticides were foliar-applied on 31 Aug on ‘Cook’ soybeans planted on 17 May. Individual plots were 4 rows wide × 50 ft long with alleys 6 ft wide on each end and 2 border rows on each side, arranged in a RCBD with 4 replications. Each spray concentrate was applied with a CO2-powered backpack sprayer with 4, TX-12 nozzles on a 6 ft boom (2 nozzles per row) at 40 psi that delivered 17.6 gal/acre. Each plot was sampled prior to treatment and on 2, 7, 14 and 21 DAT, by taking a 20-sweep sample (15-inch diam net) from a single row. Soybeans were in the R5 growth stage (pods rilling with seeds) during the testing period. At 28 DAT, the percent defoliation was visually estimated for all plots. The data were subjected to ANOVA and Duncan’s multiple range test.