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Effect of Spray Adjuvants on Heliothis zea (Lepidoptera: Noctuidae) Nuclear Polyhedrosis Virus Efficacy

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Certain characteristics of Elcar (Heliothis zea nuclear polyhedrosis virus) spray adjuvant treatments were determined in an effort to explain or identify properties of the combination which influence efficacy of the virus against Heliothis spp. on cotton. Neither Coax nor Gustol (adjuvants)affected the dosage mortality response of larvae of H. zea (Boddie) to Elcar. Laboratory studies also failed to detect ultraviolet screening properties of the adjuvant sat the rate tested (2.5% concentration). Coax and Gustol appeared to primarily affect efficacy by altering feeding or spray characteristics. Third-stage H. zea larvae consumed more cotton leaf discs treated with the virus when an adjuvant was included in the treatment. Correlation analysis showed adjuvant rate to be positively related (r = 0.92) to larval mortality, although percent concentration of adjuvant appeared to be more important than rate in influencing the spray characteristics of Elcar treatments.

Document Type: Research Article

Publication date: February 1, 1983

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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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