Suitability of the Contact Herbicide Paraquat as a Simulator of Mexican Bean Beetle (Coleoptera: Coccinellidae) Defoliation Under Greenhouse Conditions

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Under greenhouse conditions, the contact herbicide paraquat was compared with manual and Epilachna varivestis Mulsant defoliation of soybean plants. After 14 or 28 days of posttreatment growth, there were no significant height or dry-weight differences between plants defoliated with any of these three methods, even though experimental sensitivity (eight replications) was great enough to detect both height and dry-weight differences between control and defoliated plants. At the highest concentration used, there were two observations of possible paraquat movement and damage to untreated leaves. As paraquat concentration was decreased, the extent of lesion expansion beyond the treated area decreased significantly. The use of paraquat at an appropriate concentration (e.g., 14.6 µg/ml) may adequately simulate insect defoliation, because the herbicide: completely defoliated the treated leaf area but with minimum necrosis beyond the treated margin; had no additional effect son overall plant growth (height or weight); and did not interfere with vegetative phenology or flower initiation.

Document Type: Research Article

Publication date: June 1, 1984

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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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