Abstract: Several species of grasses were regularly surveyed for the existence of the Russian wheat aphid，Diuraphis noxia (Mordvilko)，during 1994～1998 in Tacheng and Hami，Xinjiang Uygur Autonomous Region. Avena fatua，Secale cereale，Elytrigia repens and volunteering wheat served as the important alternate hosts for the aphid after crop harvest. In Tacheng，early-sown winter wheat provided for RWA an overwintering refuge from where the aphids transferred to spring wheat or the alternate hosts in spring，and came back in fall.

Key words: Diuraphis noxia (Mordvilko), alternate hosts, seasonal transfer