Control of Velvetbean Caterpillars on Georgia Soybeans, 1993

The efficacy of 9 selected insecticides for control of velvetbean caterpillars was evaluated at the Georgia Coastal Plain Experiment Station, Tifton, GA. The insecticides were foliar-applied on 23 Aug on soybeans planted in early Jun. 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 n a RCBD with 5 replications. Each spray concentrate was applied with a COypowered backpack sprayer with 4, TX-12 nozzles on a 6 ft boom (2 nozzles per row) at 40 psi that delivered 17.8 gal/acre. Each plot was sampled prior to treatment and on 4, 7, 11, 14, and 22 DAT, by taking a 20- iweep sample (15-inch diam net) from a single row. Soybeans were in the R5 growth stage (pods filling with seeds) at the initiation of the test and R6 growth stage (full size beans in pods) at the conclusion. The data were subjected to ANOVA and Duncan’s Multiple Range Test.