Abstract: Incidences of Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), in relation to wheat planting date were investigated in Ili and Tacheng, Xinjiang Uygur Autonomous Ragion. The winter wheat planted early (Aug. 21～29) was attacked more seriously by RWA and with a higher infested rate. It was reduced by 40%～70% with the delay of planting date at every 10-day. The early planted (April 1～7) spring wheat, however, suffered lower infestation of the aphid and its infested rate was increased by 30%～88% with the delay of planting date at every 10-day.

Key words: Russian wheat aphid (Diuraphis noxia (Mordvilko)), planting time, winter wheat, spring wheat