On-Farm Efficacy of Aerially Applied Bacillus thuringiensis for European Corn Borer (Lepidoptera: Pyralidae) and Corn Earworm (Lepidoptera: Noctuidae) Control in Sweet Corn

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Aerial applications of Bacillus thuringiensis subsp. kurstaki and tank-mixes with synthetic insecticides were evaluated for control of Ostrinia nubilalis (Hübner) and Helicoverpa erpa zea (Boddie) in Minnesota sweet com during 1990-1992. In addition to natural infestations, sweet com was manually infested with first-instar O. nubilalis to investigate optimum timing of applications relative to larval hatch. Efficacy of B. tlwril1giel1sis was significantly enhanced when applied 2 d before larval hatch, compared with 2 d after hatch. Treatments with low-rate permethrin + B. thuringiensis or full-rate permethrin followed by B. thuringiensis provided control of O. nubilalisequal to full rates of permethrin or micro-encapsulated methyl parathion. Of the B. thuringiensis treatments, only the tank-mix of low-rate permethrin + Dipel ES significantly reduced H. zea larval infestations and yielded more marketable ears than the untreated check. Based on active ingredient per hectare, low-rate permethrin + B. thuringiensis reduced synthetic insecticide use 66%, compared with full-rate permethrin, or 92% compared with full-rate methyl parathion. Using a four-application program, permethrin followed by three B. thuringiensis applications reduced synthetic insecticide use 75'% compared With full-rate permethrin, or 94% compared with full-rate methyl parathion. Disadvantages of the use of B. thuringiensis for late-season insect management in sweet corn include application timing, incidence of H. zea, and potential for increased risk of larval contaminants in marketable product.

Document Type: Research Article

Publication date: April 1, 1995

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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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