Abstract
Abstract A cornfield near Delmont, S. Dak., was chosen to evaluate 22 compounds for control of first brood European corn borer (ECB) larvae. Preapplication counts indicated a uniform infestation of third instar, or younger, larvae in 80% of stalks sampled. Granules were applied to corn at whorl (1 wk prior to tasselling) stage of physiological development. Treatments included 11 granular, 10 liquid, and 3 untreated controls. Granular compounds were applied to single row plots (0.9 cm × 30.5 m) in a randomized complete block design with 4 replicates. Granules were directed into whorls of corn plants using a pneumatic applicator powered by a 3.5 horsepower engine attached to a highboy. Noble metering units mounted on a modified chain-driven apparatus regulated the amount of granules released into the applicator. Liquids were applied with a 3 gal C02 backpack sprayer. Approximately one month following application, 20 cornstalks were randomly chosen from each plot. Each plant was split vertically and examined for ECB tunnelling damage. The number and length of ECB cavities were recorded and analyzed.
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