Control of First-Generation European Corn Borer, 1986

Abstract

Performance of granular insecticides against ECB larvae was evaluated in a small-plot trial near Red Wing, Minn. Plots of 1 row (30-inch row spacing) by 50 ft, were located within a commercial production field that was planted on 2 May. Larvae varied from first to fourth instars with the majority in the third instar. Insecticide treatments were arranged in a randomized complete block design with 4 replicates. Granular insecticides were applied with a one-row, electrically driven, Gandy applicator that was manually pushed through the plots. A liquid standard, Pounce 3.2 EC, was applied in 17 gal water/acre at 40 psi through 8002 nozzles on a CO2-powered backpack sprayer. The treatments were applied 22 Jun when temperatures ranged from 85 to 90°F and winds were 10-15 mph. Efficacy was evaluated on 10 Aug by dissecting 10 infested plants/plot and counting the tunnels.