Natural Control of Caterpillar Populations on Cole Crops1

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In the region of Ithaca, N. Y., both Pieris rapae (L.), the imported eabbageworm, and Plutella maculipennis (Curtis), the diamondback moth, were more abundant on cole plants than Trichoplusia in (HÜbner), the cabbage looper. By weight the order of abundance was P. rapae, P. macuHpennis, and T. ni. All three caterpillars were heavily parasitized by their respective parasite complexes, and this aided greatly in controlling the pests. The species of parasite most important one season was not necessarily thc most abundant one the following season. Weather and density of caterpillars probably played an important role in determining the abundance of the parasites the year following. Predators contributed to the control of the caterpillars, but their quantitative effect could not be determined in the present design. Many factors determined when during the season the three caterpillars were abundant, and because of this it is difficult without many years of study to predict when the eaterpillars will be abundant during anyone season.

Document Type: Research Article

Publication date: October 1, 1961

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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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