Minimum Rates of Insecticides on Soybeans: Mexican Bean Beetle Green Cloverworm Corn Earworm and Velvetbean Caterpillar

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Rates of carbaryl, methomyl, methyl parathion and toxaphene + methyl parathion were determined that would result in 80% control (48 h posttreatment) of Epilachna varivestis Mu1sant, Plathypena scabra (F.), Heliothis zea (Boddie), and Anticarsia gemmatatis Hubner. Tests were conducted on a regional basis in Alabama, Florida, Georgia, and South Carolina.

Rates much lower than those recommended prior to 1972 gave effective pest control. Minimum effective rates (80% control compared to untreated checks) for these insects were obtained with carbaryl at 0.50 lb AI/acre or less, methomyl at 0.13 lb or less, methyl parathion at 0.25–1.00 lb (high rate for H. zea), and toxaphene + methyl parathion at 0.25 + 0.13 to 1.00 + 0.50 lb. Inclusion of such rates in state recommendations should greatly reduce the amount of insecticides applied to soybeans.

Document Type: Research Article

Publication date: April 1, 1974

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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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