Beet Armyworm (Lepidoptera: Noctuidae) Adult and Larval Susceptibility to Three Insecticides in Managed Habitats and Relationship to Laboratory Selection for Resistance


Source: Journal of Economic Entomology, Volume 83, Number 6, December 1990 , pp. 2136-2146(11)

Publisher: Entomological Society of America

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A field bioassay that measures adult male susceptibility was used to document resistance to fenvalerate, permethrin, and methomyl in beet armyworm, Spodoptera exigua (Hubner), in California, Baja California Norte (Mexico),and Sinaloa (Mexico).At the LC"o", the highest levels of resistance (R) were typically found at sites in Monterey County, Calif. (resistance [R] ratio of 11 and 29 for fenvalerate and methomyl, respectively); Kern County, Calif. (R ratio of 10 and 19 for fenvalerate and methomyl, respectively), and the Del Fuerte and Guasave valleys of Sinaloa (R ratio of 22, 7, and 16 for fenvalerate, permethrin, and methomyl, respectively). Geographic and temporal variability in resistance followed this trend: overall variation among regions> variation among sampling dates at the same site within a region ˜ variation among sites in a region within three consecutive days. Concurrent with field bioassays, larval susceptibility was measured with topical application bios says in the laboratory. Resistance was detected in larvae. Larval and adult susceptibility were significantly correlated for fenvalerate and methomyl (r = -0.84 and -0.78, respectively). Selection experiments with fenvalerate and methomyl on larvae confirmed potential for increases in resistance. For fenvalerate, adult susceptibility was similar to larval susceptibility in selection experiments, agreeing with the above adult-larval correlations. This correspondence was not apparent for methomyl.

Document Type: Research Article

Publication date: December 1, 1990

More about this publication?
  • 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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