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Tolerance of Three Beet Armyworm Strains in Arizona to Methomyl

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Tolerance levels of Spodoptera exigua (Hübner) to methomyl were investigated in Arizona. Laboratory cultures developed from feral collections in the Yuma, Mesa, and Safford localities were reared on a pinto bean diet. Acetone solutions of test grade methyl were topically applied with a standard microapplicator. Dosage-mortality data were obtained from 3rd instars held for 24 h after treatments. The Safford and Mesa strains were 3 times as tolerant as the Yuma strain. Dosage-mortality curves indicated a potential for resistance, but comparison with a 14-yr-old USDA strain showed that no methomyl resistance of any consequence is present in Arizona populations.

Document Type: Research Article

Publication date: August 1, 1978

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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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