Diet Influences on Permethrin Susceptibility and Growth of Soybean Looper Larvae (Lepidoptera: Noctuidae)

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Larvae from several strains of soybean looper, Pseudoplusia includens (Walker), were reared on artificial diet, soybean foliage, and cotton foliage and tested for susceptibility to permethrin. Larvae from all three strains were significantly less susceptible to permethrin when reared on cotton than when reared on artificial diet. There were no significant differences in LD50s between soybean and artificial diet-reared larvae for any of the strains. Larvae from a permethrin-selected laboratory strain were 2-fold less susceptible when reared on cotton than on soybean; no significant difference in LD50 between soybean and cotton-reared larvae occurred for the other strains. Three soybean looper strains also were reared on soybean and cotton to compare development of soybean looper on these hosts. The development time of all three strains from eclosion to pupation was significantly longer when reared on cotton than on soybean, and all larval stadia except the second and third ins tars lasted significantly longer. Larvae and pupae tended to be heavier when reared on cotton, and there was no evidence of lower survival rates or increased incidence of supernumerary stadia when soybean looper developed on cotton, indicating that cotton is a suitable host for the insect.

Document Type: Research Article

Publication date: August 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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