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Influence of Wind Speed and Placement of Granules on Efficacy of Soil Insecticides Against Corn Rootworm (Coleoptera: Chrysomelidae)

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Displacing the bands of granular insecticide 15 cm to one side of corn rows significantly decreased the efficacy of terbufos, but not that of carbofuran or chlorpyrifos when used for the control of corn rootworm larvae (Dtabrotica spp.). Consistent, perpendicular winds of up to 34 km/h at ground level were obtained using a furnace blower attached immediately adjacent to the insecticide spreader of an outside row of a four-row commercial corn planter. Mean root ratings were about 0.5 higher on the Iowa 1-6 root rating scale in the windward rows. Root damage ratings increased with wind velocity. Infurrow applications from tubes that dispensed the granules near the ground were unaffected by wind. Banded treatments behind the wheels that close the seed slot were most affected. In these studies, only the first one or two rows of corn on the windward side of the planter suffered significant damage. However, the blower with a single orifice (26.7 by 29 cm) probably underestimated the effect of a natural wind, especially on rows farther removed from the source.

Document Type: Research Article

Publication date: February 1, 1991

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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