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A cornfield near Parkston, SD, was chosen to evaluate 35 chemical and biological insecticide treatments for control of first-generation ECB larvae. Preapplication counts indicated a uniform infestation of ECB larvae in 71.0% of plants sampled. Stadial composition consisted of 20, 35, 35, and 10% 1st-, 2nd-, 3rd-, and 4th-instar, respectively. Treatments were applied on 7 Jul at whorl (approximately 1 wk prior to tasseling) stage of physiological development. Three untreated control plots were used to compare 10 granular insecticides and 25 liquids for efficacy in preventing ECB tunnelling. Treatments included multiple rates of some compounds. Insecticides were applied to single row plots (16.4 cm by 30.5 m) in a RCBD with 4 replicates. Granules were directed into corn plant whorls using a pneumatic applicator powered by a 3.5 horsepower engine mounted on a Highboy. Noble metering units attached to a modified chain-driven apparatus regulated the amount of granules released into the pneumatic applicator. Liquid treatments were applied to corn plant whorls using a single-nozzle 3-gal, CO2-propeIled backpack sprayer system. Approximately I month following insecticide applications (12 Aug), 20 corn stalks were randomly chosen from each plot. Each plant was split vertically and examined for tunnelling damage. The number and length of cavities were analyzed using SAS’s General Linear Models procedure with means being compared by DMRT.

First Generation European Corn Borer Control Using Insecticide Rescue Treatments, 1994