NEW NORTH AMERICAN HOST RECORDS FOR APHELINUS SP. NR. VARIPES (FOERSTER) (HYMENOPTERA: APHELINIDAE): THE WESTERN WHEAT APHID, DIURAPHIS TRITICI (GILLETTE), AND THE RUSSIAN WHEAT APHID, DIURAPHIS NOXIA (MORDVILKO) (HOMOPTERA: APHIDIDAE)

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Abstract
First detection of the Russian wheat aphid, Diuraphis noxia (Mordvilko), in the United States occurred in March 1986 in the Texas panhandle. Within 3 years, this aphid pest was found in 15 western states and three provinces in Canada. Each year since 1986, Russian wheat aphid has been responsible for millions of dollars in grain loss and insecticide treatment costs (Anonymous 1988, 1989). Physiological responses of the plants to the aphid include chlorotic streaking, rolled leaves, entrapment of developing seedheads, stunting, reduced tiller production, and reduced yields (Hewitt et al. 1984; Johnson et al. 1988; unpublished data).

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