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A -exotoxin of Bacillus thuringiensis Berliner was tested on first-, third-, and fourth-instar Spodoptera frugiperda (J. E. Smith), Heliothis zea (Boddie), and Trichoplusia ni (Hübner). Larvae were placed on diet including 10–12 concentrations of the -exotoxin ranging from 0 to 200 g (AI)/ml of diet. LC50's for first-, third-, and fourth-instar S. frugiperda were 0.4, 7.2, and 123.7 g (AI)/ml, respectively. H. zea larvae were less sensitive to the toxin, with LC50's for first, third, and fourth instars of 1.0, 14.2, and 127.3 g (AI)/ml, respectively. T. ni was most sensitive, with LC50's of 0.3, 5.2, and 14.4 g (AI)/ml for first, third, and fourth instars, respectively. Dose/mortality response curves for fourth-instar S. frugiperda and T. ni were nonlinear throughout the assay period and indicated a possible feeding deterrent factor associated with the toxin. Fecundity of moths developing from larvae exposed to -exotoxin was lower than fecundity of moths developing from larvae fed on untreated diet.
Document Type: Research Article
Publication date: August 1, 1987
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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.