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Relative Susceptibility of Six Soybean Caterpillars to a Standard Preparation of Bacillus thuringiensis var. kurstaki

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Abstract:

The LC50 of a standard preparation of B. thuringiensis Berliner var. kurstaki against 1-day-old larvae of Trichoplusiani (Hübner) was 90 ng/cm2 of diet surface. One-day-old larvae of Anticarsia gemmatalis Hübner and Plathypena scabra (F.) were > 10 × more susceptible than T. ni; Pseudoplusia includens (Walker) was equally susceptible, and Spodoptera exigua (Hübner) and Heliothis zea (Boddie) were ca. 3 × less susceptible. The LC50 against 4-day-old T. ni was 1800 ng/cm2 of diet surface, and the relative ranking for susceptibility of 4-day-old larvae of the other species was similar to that for 1-day-old larvae. Also ranking for susceptibility based on weight of larvae that survived was identical to that based on larval mortality.

Document Type: Research Article

Publication date: February 1, 1977

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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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