Dosage-Mortality Studies with Pyrethroids and Other Insecticides on the Tobacco Budworm (Lepidoptera: Noctuidae) from the Imperial Valley, California

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Dosage-mortality studies were conducted on populations of the tobacco budworm, Heliothis virescens (F.), from the Imperial Valley of California in 1979, 1980, and 1981. Progeny of field-collected budworms showed a steady increase in resistance over this period. Levels of resistance to permeethrin, fenvalerate, and methyl parathion increased to 51-, 29-, and 18-fold, respectivcly, compared with data from a susceptible laboratory colony. The LD50 for methomyl was greater than 2,000 µg/g of body weight, whereas the LD50 for this compound in the susceptible strain was 3.25 µg/g. Values obtained in the first generation decreased in the second generation of laboratory rearing and remained at this lower level in subsequent generations. This indicates that evaluation of insecticide resistance in this insect should be performed on the first generation. Response to permethrin was not different using field-collected larvae or adults to initiate the colony. However, higher LD50 values were obtained during October as compared with September collections.

Document Type: Research Article

Publication date: October 1, 1983

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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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