Laboratory and Field Evaluations of Pathogen-Adjuvant Treatments

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Mortality among 24-h-old Trichoplusia ni (Hühner) or Heliothis zea (Boddie) larvae in bioassays of formulations containing either Bacillus thuringiensis Berliner or a nuclear polyhedrosis virus. Baculovirus heliothis. was significantly lower when cotton foliage was the test substrate than when soybean or cabbage was used. The incorporation of a soybean flour adjuvant (with one exception) significantly increased mortality among test larvae when compared with standard water-B. thuringiensis or water-virus suspensions. Increasing the application rate of the soybean flour adjuvant from 1.12 to 4.49 kg/ha did not significantly increase larval mortality. Spray nozzle size (TX-2, TX-4, TX-8, TX-12) did not affect mortality among test larvae exposed to soybean foliage treated with formulations containing the soybean flour adjuvant; however. average mortality for the formulation containing the adjuvant was eight times higher than that for the standard water-virus suspension containing the same amount of virus. Based on the half-life of each suspension, aqueous cottonseed and soybean adjuvants plus virus suspensions were ca. 3.3 and 2.2 times more effective, respectively, under field conditions, than a virus-water suspension.

Document Type: Research Article

Publication date: June 1, 1982

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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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