Occurrence of hymenopterous parasitoids of Diuraphis spp. in the Western Rocky Mountain region.

摘要

Surveys were conducted in 2007 and 2008 to identify the hymenopterous parasitoids capable of parasitizing Diuraphis spp. at 80 locations in three discrete ecoregions of the Central Mountain region of the USA (Jackson, Wyoming, for ecoregion 1; Eastland, Utah, and Dove Creek, Durango, Hotchkiss, Meeker and Yellow Jacket, Colorado for ecoregion 2; and Panonia, Colorado, for ecoregion 3). Seven species of hymenopterous parasitoids were recovered from four Diuraphis species. In ecoregion 1, Diuraphis noxia on volunteer barley was parasitized by Aphelinus albopidus and Diaeretiella rapae. Diuraphis frequens was parasitized by Aphelinus albopidus. In ecoregion 2, Diuraphis noxia collected from 7 host plant species (including wheat) was parasitized by 5 parasitoid species. Diuraphis mexicana and Diuraphis tritici were parasitized exclusively by Aphelinus albopidus. In ecoregion 3, Diuraphis noxia and Diuraphis frequens were parasitized by Aphelinus albopidus, Aphelinus varipes, Diaeretiella rapae and Ephedrus plagiator. Aphelinus asychis was only recovered from Diuraphis noxia in ecoregion 2, whereas Aphelinus varipes was recovered from Diuraphis noxia and Diuraphis frequens in ecoregion 3. Lysiphlebus testaceipes and Aphidius colemani were recovered only from Diuraphis noxia in ecoregion 2.