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Quarter-Plant Samples to Detect Populations of Lepidoptera (Noctuidae, Pieridae, and Plutellidae) on Cauliflower

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Four methods of sampling eggs and larvae of imported cabbageworm, Pieris rapae (L.), and larvae of diamondback moth, Plutella xylostella (L.), and cabbage looper, Trichoplusia ni (Hũbner), on cauliflower, Brassica oleracea var. botrytis L., were evaluated. Plants were sampled by examination of the leaf surfaces of one quarter, one half, or the whole plant, or by a destructive method. Plants that were treated biweekly with permethrin at 140 g (AI)/ha required 22% less time to sample and had 58% more P. rapae eggs per plant than did unprotected plants. Fewer cabbage looper equivalents (CLE) per plant per week were estimated with half-plant samples than with quarter-plant, whole-plant, or destructive samples. An efficiency index-the product of relative variability, number of CLE per plant, and sampling time-was greater for quarter-plant samples than for half-plant samples, relative to destructive samples. The quarter-plant sample was the most appropriate unit for sampling leaf-feeding insects on cauliflower.

Document Type: Research Article

Publication date: June 1, 1989

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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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