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Natural Control of Aphid Populations on Cole Crops1

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The factors involved in the natural control of the most numerous aphids on cole crops were studied. During the 1957 season the cabbage aphid (Brercoryne brassicae (L.)) was the most. abundant aphid followed by the green peach aphid (Myzus persicae (Sulzer), whereas the turnip aphid (Rhopalosiphum pseudobrassicae (Davis) was least abundant. In 1958 the order of abundance was: the green peach aphid, turnip aphid, and cabbage aphid. A parasite, Proon sp., attacked only .M. persicae. Diaeretus rapae (MeJntosh) and Empusa aphidis Hoffman attacked all three aphids. The ratio of parasitism was greatest the most dense aphid population and smallest in the sparse population. Coceinellids of the following species destroyed aphids: Hippodamia convergens Guerin-Meneville, Ceratomegilla maculate fuscilabris De Geer, and Coccinella transversoguttata Faldermann. Syrphids attacking the aphids were: Splzaerophoria cyclindrica Say, S. menthastri (L.), S. robusta (Curran), and Mesogramma marginata Say.

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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