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Persistence of Spores of Vairimorpha necatrix on Tobacco, Cotton, and Soybean Foliage

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Vairimorpha necatrix (Kramer) spore suspensions with and without adjuvants were sprayed onto foliage of 3 agricultural crops from which random samples of leaves were subsequently bioassayed for infective spores with 3rd instars of the corn earworm, Heliothis zea (Boddie). Spore persistence, which lasted for up to 2 wk in some treatments, was affected more by spore dosage than by UV light protectants and sticker-spreader adjuvants. Spore survival up to 4 days after application was higher on tobacco than on cotton; and from 7–14 days, survival was higher on soybeans than on tobacco or cotton. Spore persistence under field conditions was sufficient not to in terfere with effectiveness and possible development of V. necatrix as a microbial control agent for the temporary suppression of certain lepidopterous pests.

Document Type: Research Article

Publication date: April 1, 1978

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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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