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Structure of Populations of Lygus hesperus (Hemiptera: Miridae) with Multiple Resistance Mechanisms to Trichlorfon

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Five populations of Lygus hesperus Knight collected from alfalfa fields in Utah and Idaho were exposed to a range of concentrations of trichlorfon in a contact bioassay using plastic, self-closing bags. Various degrees of resistance were noticed. Esterase activity and acetylcholinesterase (AChE) insensitivity were assayed in 160 individuals from each population. Esterase activity of the most resistant population from Idaho 'was more than four times that of the susceptible Utah population, and AChE of the most resistant population was only one-third as sensitive to 10-7 M paraoxon. We detected a linear correlation between esterase activity and AChE insensitivity levels with the logarithm of the LC50s. Population structures were discerned from distribution patterns of esterase activities and AChE insensitivities, as well as from slopes of the responses. The susceptible population was very homogeneous and the resistant populations were more heterogeneous. Interactions between the multiple resistance mechanisms are discussed.

Document Type: Research Article

Publication date: December 1, 1993

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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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