Evaluation of a Binomial Model for Insecticide Application to Control Lepidopterous Pests in Cabbage

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A binomial model for insecticide application was developed from counts of cabbage looper equivalents on cabbage grown on Prince Edward island, Canada, from 1988 to 1991. A threshold of 40% of plants infested with at least one larva of any of three species of Lepidoptera attacking the crop coincided 94.7% of the time with a threshold of 0.25 cabbage looper equivalents per plant that was used in insecticide efficacy trials. A field evaluation of plots managed with a threshold of 40% of plants infested, or plots managed with a threshold of 0.25 cabbage looper equivalents per plant at one site in 1992, and three site's in 199.'3, resulted in mean numbers of applications of insecticides and yields that were similar. Plots managed at the threshold of 40% of plants infested, however, required 42% less time to sample, which would result in a significant cost reduction to the grower for crop scouting.

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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