Abstract: During the investigation period in Ili Prefecture, Xinjiang Uygur Autonomous Region, 195 and 36 wheat varieties were accessed for their susceptibility to Russian wheat aphid (RWA), (Diuraphis noxia (Mordvilko)) in 1993 and 1994 respectively. Comparison of infestation grades among 36 wheat varieties by RWA in the two years showed that half of them were within the same grade. The aphid hardly attacked the “Onekernel wheat”, Triticum monococcum. 13, 2 and 2 of these varieties consistently showed low (＜20%), middle (between 20% and 40%) and high (＞60%) infestation rates by RWA respectively. However, there are 18 other varieties displayed obvious change in their infestation grades. In addition, the varieties “Spring Wheat 901” and “Shiyin1 of Beer Barley” being introduced into Tacheng were seriously infested by RWA in 1996.

Key words: Russian wheat aphid (Diuraphis noxia (Mordvilko)), wheat varieties, susceptibility