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<i>Three species of</i> Diuraphis <i>in addition to the Russian wheat aphid</i>, Diuraphis noxia <i>(Mordvilko), occur in western Colorado</i>. Diuraphis (Holcaphis) tritici <i>(Gillette), the western wheat aphid, and</i> Diuraphis nodulus <i>(Richards) were collected near Meeker (Rio Blanco County) in 1990. Both species were found feeding in seed production fields of mountain brome</i>, Bromus marginatus, <i>and have required chemical control at times to avert economic damage</i>. Diuraphis (H.) frequens <i>Walker was found in 2 localities in 1990. It was found in all but 1 growing season since that time in the West Elk Wilderness (Gunnison County), feeding on blue wild rye</i>, Elymus glaucus. <i>Males and oviparae of all 3 species were collected in 1991. Eggs of</i> D. (H.) tritici <i>and</i> D. nodulus <i>were collected in the spring and again in the fall of 1992. Two species of parasitic Hymenoptera, and 2 species of hyperparasites were collected from</i> D. (H.) tritici <i>and</i> D. nodulus <i>during the study. Several predatory beetles, flies, true bugs, and green lacewings were collected from all of the Diuraphis species.</i>
Knowledge graph centered on Natural History of <i>Diuraphis</i> (H with 13 nodes and 64 connections. Top connected: Beetles, Hymenoptera, Bromus, Bromus inermis, Aphididae.
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