Palatability of Flour Granular Formulations to European Corn Borer Larvae (Lepidoptera: Pyralidae)

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Newly developed techniques for producing starch and Hour granule formulations encapsulating Bacillus thuringiensis Berliner have led to a large number of potentially effective baits for Ostrinia nubilalis (Hübner). One aspect of these formulations that must be considered is their palatability to corn borer larvae. Experiments were conducted to determine palatability of several formulations in two-choice preference tests. Corn borer larvae preferred flour granules containing cotton leaves or a commercially available feeding stimulant, Coax, or both. Larvae rejected granules formulated with CaCI2. Granules made with molasses were intermediate in palatability. When the granules were formulated with 1,600 International Units (IU) B. thuringiensis per mg granules and 20 mg of granules were sprinkled on cotton leaves, several formulations killed >70% of the corn borer larvae that fed on treated leaves; other formulations killed <40% of the test insects. Mortality was reduced when larvae were exposed to cotton leaves sprinkled with granules formulated with CaCI2 when compared with those formulated with cotton leaves or Coax, or both. The dose of B. thuringiensis could be reduced by 3/4 (i.e., to 400 IU/mg) without affecting the level of larval mortality if the pathogen was entrapped in granules containing cotton leaf tissue + Coax or only cotton leaf tissue.

Document Type: Research Article

Publication date: April 1, 1994

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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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