Various collections of Heliothis virescens (F.) from different locations in southern California were tested for resistance to methyl parathion, fenvalerate, and cis-permethrin using the topical application methods on 8 mg larvae. Baseline levels of susceptibility for these 3 compounds were established in 1975 at 6.16, 1.01, and 0.35 g/g, respectively. The resistance level for these compounds for larvae collected from cotton in the Imperial Valley increased gradually during both the 1977 and 1978 seasons although there was a notable decrease in these levels between the 2 seasons. At the end of the 1978 season, resistance levels as high as 9.8, 8.5 and 13.7X, respectively, were monitored. Larvae from other areas of southern California were susceptible to these compounds.
Document Type: Research Article
Publication date: April 1, 1980
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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.