Within-Field Distribution of Greenbug (Homoptera: Aphididae) and Its Parasitoids in Texas Winter Wheat

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Field sampling of wheat aphids and their parasitoids showed that the green bug, Schizaphis graminum (Rondani), was the most abundant aphid species present, followed by the oat-bird cherry aphid, Rhopalosiphum Padi (L.). The primary parasitoids reared from greenbug, in order of abundance, were Lysiphlebus testaceipes (Cresson), Diaeretiella rapae (M'Intosh), and Aphelinus nigritus (Howard). The hyperparasitoids obtained, in order of abundance, were Alloxysta sp. (megourae complex), Asaphes lucens (Provancher), and Pachyneuron siphonophorae (Ashmead). Samples taken in three separate wheat fields indicated that S. graminum and R. padi were distinctly aggregated. Collectively, the green bug parasitoids were distinctly aggregated and had a significant effect on the density of S. graminum within two of the three fields. Parasitoid distribution in the third field was near random, and no significant relationship was observed between numerical fluctuations of the greenbug and its parasitoids.

Document Type: Research Article

Publication date: February 1, 1983

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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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