Role of Indigenous Coccinellids in Regulating Greenbugs (Homoptera: Aphididae) on Texas Grain Sorghum

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The effectiveness of the native coccinellid predators of the greenbug, Schizaphis graminum (Rondani), was determined in Texas high plains grain sorghum using exclusion techniques. The most abundant greenbug predators encountered were Hippodamia convergens (Guerin-Meneville) and H. sinuate (Mulsant). Natural enemies showed no significant suppressive capacity during the early portion of the growing season, though both Hippodamia species were frequently observed. Selective exclusion of adult Hippodamia spp. and larger predators demonstrated the efficacy of these enemies throughout the latter portion of the growing season. Introduction of the two coccinellid species into cages excluding all enemies indicated their capacity to reduce greenbug density in light or moderate greenbug infestations. Regulation of greenbugs in Texas high plains grain sorghum is largely due to the suppressive action of Hippodamia spp., not the common greenbug parasites of the region.

Document Type: Research Article

Publication date: February 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.
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