Composite Economic Threshold for Three Lepidopterous Pests of Cabbage
Authors: Kirby, R. D.; Slosser, J. E.
Source: Journal of Economic Entomology, Volume 77, Number 3, June 1984 , pp. 725-733(9)
Publisher: Entomological Society of America
Abstract:A composite threshold for three lepidopterous cabbage pests, Trichoplusia ni (Hübner), Plutella xylostella (L.), and Pieris rapae (L.), was developed for use in fresh market cabbage. A multiple regression model was developed which describes percent marketable yield as a function of selected variables. The variables were: seasonal mean number of all larvae per plant, percent T. ni larvae > 13 mm in length prior to the plant stage of "cupping," mean seasonal temperature in °C, and the interactions among these three variables. The threshold was shown to be dynamic, but a static, composite threshold of 0.30 larvae per plant would produce at least an 80% marketable yield. Insecticide treatment schedules based on assessment of larval populations resulted in a reduction of from one to four-and-one-half applications below the number used in a 5- to 6-day automatic schedule, while simultaneously providing the same or higher yields.
Document Type: Research Article
Publication date: June 1984
- 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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