First Generation European Corn Borer Larvae, Efficacy Trials, Kansas, 1987

Naturally infested late-whorl-stage yellow held corn was treated on 13 Jun. Eighteen insecticides and 2 untreated controls were arranged in a randomized complete block design with 4 replications. All plots consisted of 4 contiguous rows, each 12 m in length with 90-cm row spacing. Sprays were applied in water (20 gal/acre) with a C02-powered system held above the canopy on a modified backpack frame. Each treated row received spray from 2 opposing nozzles suspended over the row at a 45-degree angle (dp size HC-6) and applied at 40 psi. Granular products were applied using modified electric drive Nobel applicators mounted on a self-propelled highi clearance sprayer or manually banded using a funnel and bander system. Band spreaders were positioned approximately 5 cm above the whorl and distributed products over a 20-cm band.