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Interplot movement of introduced and naturally occurring predators of aphids on potatoes in small plots prevented accurate assessment of the effects of sequential introductions of eggs and larvae of Coccinella septempunctata L. or Chrysopa spp. Neither barriers of oats nor 8-in. aluminum flashing standing on edge on the soil's surface prevented interplot movement. Interplot movement of predators appeared to be a less confusing factor in small fields than in small plots. Larger sized plantings will be required to assess the effects of introduced predators unless a successful harrier can be devised to confine the predators in smaller plots. Results in large field cages corroborated those in small fields and showed when 2 species of aphids were present on potato plants, larvae of C. septempunctata are more potato aphids. Macrosiphum euphorbiae (Thomas), than green peach aphids, Myzus persicae (Sulzer) whereas larvae of Chrysopa spp. consumed more green peach aphids than potato aphids.
Document Type: Research Article
Publication date: April 1, 1972
More about this publication?
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.