The relative population densities of Circulifer tenellus (Baker), associated leafhoppers, and their egg parasitoids were monitored on sugar beets in four different geographical locations in southern California. Yellow sticky cards were used to trap adult leafhoppers. Peak flight activity of adult C. tenellus and Empoasca spp. occurred in late spring and summer, although flight activity was common throughout the year. Sugar beet leaf samples were collected to monitor oviposition of leafhoppers and parasitization by egg parasitoids. Egg parasitoids collected were Anagrus giraulti Crawford, Polynema sp. and Gonatocerus sp. (Mymaridae), and Paracentrobia sp. and Aphelinoidea sp. (Trichogrammatidae). The observed rate of egg parasitization exceeded 90% at numerous intervals throughout 1982 and 1983, which appeared to have a major impact on leafhopper population density, resulting in low numbers of nymphs emerging from pesticide-free sugar beets.
Document Type: Research Article
Publication date: April 1, 1985
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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.