A -exotoxin of Bacillus thuringiensis Berliner was tested against fourth-instar Heliothis zea (Boddie) to determine its impact on ability of larvae to feed. Fourth-instar H. zea were fed diet treated with 0.0, 25.0, 35.0, 50.0, and 100.0 g of -exotoxin per milliliter of diet. Upon molting, larvae were transferred to untreated peanut leaves and consumption (square centimeters) was measured during the fifth stadium. Intoxication by each , -exotoxin concentration caused a significant reduction in mean total leaf consumption that decreased exponentially with increased concentration. In each treatment group, the majority of total leaf area consumed was eaten by those larvae that survived intoxication. However, mean total leaf consumption by treated survivors was significantly less than that by untreated larvae and decreased with increasing -exotoxin concentration. Many treated larvae experienced a prolongation of their fifth stadium, but their mean total leaf consumption was also significantly less than that by untreated cohorts.
Document Type: Research Article
Publication date: June 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.