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Insecticide Bioassays with Field Populations of Alfalfa Weevils, a Simplified Approach

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Adults and larvae of Hypera postica (Gyllenhal), were collected from the field and tested with a simplified contact biological assay with carbofuran, methidathion, phosmet, and carbaryl. Carbofuran and methidathion, with 24 h LC50 values from 0.05 to 1.39 g/vial were the most toxic to either adults or larvae. Phosmet had a similar LC50 to young adult weevils but was much less effective against larvae. Carbaryl was ineffective in the contact tests against either adults or larvae. The simplified assay conducted without rigid control of insect age or sex or environmental parameters could be suitable for field research in agricultural entomology or for preparing test kits to provide early warning of insecticide resistance.

Document Type: Research Article

Publication date: April 1, 1975

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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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