Efficacy of Registered and Experimental Insecticides for Control of First-Generation European Corn Borer, 1997

Abstract

Abstract Each plot consisted of four 30-inch-wide by 100-ft-long rows with four replications. Treatments were applied to the center two rows of each plot leaving two untreated rows between each plot. A RCB design with four replications was utilized. Two untreated check plots were included in each replication and were averaged for the ANOVA. On 27 Jun, 10 consecutive plants in each of the middle two rows of a 4-row plot were in-fested by placing two ECB egg masses (black-head stage) in the whorl of each plant. On the day of infestation, corn plants were in the 5-6-leaf stage. All insecticide treatments were applied with a modified John Deere 6000 high-clearance vehicle (HCV). Granular insecticides applied on 2 July, were metered through Noble units mounted in brackets on the rear of the HCV. The Noble units were driven with electric motors, and the granules were applied over the whorls in a 7-inch band. The planting-time liquid treatments of Regent 4 SC 0.13 lb (AI)/acre were applied 15 May using microtubes directed into the furrow and calibrated to deliver 1.0 gpa at 20 psi and 3.0 mph. The post-infestation liquid insecticides were applied on 2 Jul with two 8003 TeeJet flat-fan nozzles (one per row) in a band over the row with a compressed-air system calibrated to deliver 9.7 gpa at 20 psi and a speed of 2.5 mph. The height of the nozzles above the whorls was 10 to 12 inches.