Abstract
Abstract A corn field near Delmont, SD, was chosen for evaluating 29 European corn borer (ECB) treatments. On 5 May the crop was sown with a 38 inch row spacing. Preapplication counts indicated a uniform distribution of first-, second-, or third-instar ECB larvae in 30% of those corn stalks sampled. Treatments (2 untreated controls, 2 liquid, and 25 granular compounds) were established to evaluate their efficacy in controlling first brood ECB larvae. Granular compounds were applied on 18 Jun to single row plots (0.9 cm by 30.5 m) in a randomized complete block design with 4 replications. Granules were placed in the whorl of corn plants from a highboy using a pneumatic applicator powered by a 3.5 hp engine. Noble metering units were mounted on a modified chain driven apparatus which regulated the amount granular insecticide released. Liquid compounds were applied with a 3.0 gal COa backpack sprayer. Insecticide application rates were computed on a broadcast basis using a band width of 12 inches applied directly in the whorl. These rates may be different from those reported by other investigators where treatments are computed on a linear area basis (linear ft of row) to establish corn rootworm application rates. The broadcast application rates are approximately 0.33 of the rootworm application rates. At the 48th day postapplication, 20 corn stalks were randomly chosen from each plot. Plants were split vertically and examined for ECB tunnelling damage. The number and length of ECB cavities were recorded.
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