Nymph developmental duration, adult longevity, fecund period and the mean relative growth rate of winged and wingless morphs of Rhopalosiphum padi (L.)were compared. The results indicate that there were no significant differences in adult longevity, reproductive duration or the number of generations of offspring between the winged and wingless morph of two varieties. Significantly difference between winged and wingless morphs was observed in offspring numbers, average offspring per generation and unborn embryos. Offspring numbers of the winged morph were significantly less than those of the wingless morph, and the developmental duration of the winged morph from emergence to adult oviposition was significantly longer than that of the wingless morph. The mean relative growth rate of R. aphid was slower when feeding on HR variety wheat than when feeding on the KOK-1679 variety. These results show that R. padi has adapted to the KOK-1679 variety after several generations.