Abstract
Abstract The efficacy of 13 selected insecticides for control of velvetbean caterpillars was evaluated at the Georgia Coastal Plain Experiment Station, Tifton, GA. The insecticides were foliar-applied on 22 Aug on ‘Davis’ 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 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 3, 7, 15 and 21 DAT, by taking a 20-sweep sample (15-inch diam net) from a single row. At 28 DAT, all plots were visually rated for percent defoliation. 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.
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