EFFICACY OF SELECTED INSECTICIDES FOR CONTROL OF FOLIAGE-FEEDING LEPIDOPTEROUS PESTS IN SOYBEANS, 2011

On 31 August 2011, a foliar insecticide trial was initiated in Brooksville, Mississippi. Soybean plants were at approximately R4 stage of maturity. Statistical design was arranged in a randomized complete block with four replications. Plot size was 4 rows by 40 ft long on 38 inch centers. Seven insecticides were evaluated against the untreated check (UTC) for control of soybean looper (SBL), velvetbean caterpillar (VBC), and green cloverworm (GCW). Insecticides were applied with a tractor-mounted sprayer calibrated to deliver 10.0 gpa at 60 psi through TX-6 Hollow Cone nozzles (2 per row). Insecticides were applied on 31 August. There are two sample dates following the application of treatments: 2 days after treatment (2 DAT) and 6 day after treatment (6 DAT). Plots were sampled by taking 25 sweeps per plot with a sweep net on each sampled date and recording the number of soybean looper, velvetbean caterpillar, and green cloverworm larvae per 25-sweep sample. Data was analyzed with ANOVA and means were separated using Fisher’s Protected LSD (P≤ 0.05).