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Occurrence of Hymenopterous Parasitoids of Diuraphis spp. in the Western Rocky Mountain Region

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Four species within the genus Diuraphis occur in the western United. The Russian wheat aphid, Diuraphis noxia Kurdjumov, an invasive species which was first detected in the United States in the spring of 1986, is the only economically important one of this group. It is the most prevalent species of Diuraphis and is a perennial pest of wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.) in the cereal production regions of the Great Plains. The other three Diuraphis spp. are indigenous and occur primarily on wild grasses. Diuraphis frequens (Walker) has been collected from several grass species, including wheat, but is most commonly found on blue wildrye (Elymus glaucus Buckley). The western wheat aphid, Diuraphis tritici (Gillette), which has on rare occasion caused localized economic loses of wheat, primarily colonizes wild grasses, most frequently mountain brome (Bromus marginatus Nees ex Steud). Finally, Diuraphis mexicana (Baker) which has not been reported to colonize cultivated cereal has the most narrow host range, occurring only on Bromus spp.
John D. Burd , Gary J. Puterka
USDA Scientist Submission
Southwestern entomologist 2012 v.37 no.2
Journal Articles, USDA Authors, Peer-Reviewed
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