Abstract
Abstract Seven studies were conducted in dryland corn in Nunda, S. Dak., using standard recommended and reduced rates of commonly used granular insecticides. The experimental design for all studies was a randomized complete block with 4 replications. Individual treatment plots consisted of single rows, 15 m long, with 96.5 cm row spacing. Granular formulations of insecticides were applied with modified Noble metering units mounted on a specially adapted Kinze, 4-row corn planter. The metering units were grounddriven, and all units were calibrated on the planter. Insecticide granules were applied in a 7-inch band in front of the furrow-closing wheels and incorporated by the wheels and drag chains. Furrow applications were directed immediately between the double disk furrow openers. Pioneer 3615 corn was seeded at a rate of 23,000 kernels/acre at all study locations. Five roots/replication were dug from each treatment. Roots were washed, examined for rootworm feeding damage, and rated in accordance to the Iowa 1-6 scale.
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