Cereal Leaf Beetle Control on Malting Barley, 1996

Malting barley was planted by a producer located near Edgar, MT on 13 Apr. Plots were 20 ft long and 8 rows wide (1 ft row spacing) and arranged in a RCB design with four replications (Trial 1) and 3 replications (Trial 2). Insecticide applications were made using a backpack, CO2-powered sprayer equipped with TeeJet XR8002VS nozzles, calibrated to deliver 8.2 gpa at 30 psi. Number of CLB eggs and larvae per plant were counted on 3 plants from center rows. Plots in Trial 1 were treated on 17 May when barley was at 2 to 3 tiller stage and evaluated on 1,3, and 11 DAT. No CLB larvae were detected until 28 May. A second trial was conducted to determine insecticide efficacy on CLB larvae. Plots in Trial 2 were treated on 4 Jun when barley was beginning to joint and evaluated on 1,3, 7, and 14 DAT. Data were analyzed using ANOVA and means were separated using DMRT.