Abstract: Cereal aphids infest plants in distinct patterns both in spatial and temporal terms. The distribution patterns of Rhopalosiphum padi (Linnaeus), Metopolophium dirhodum (Walker) and Schizaphis graminum (Rondani) in time and space on wheat varieties Fahari, Mbega and Duma were studied in field plots and sampled at six growth stages. The experiment was done during the long seasons of 2001 and 2003. Results showed that aphid species differed in their time of colonisation. R. padi appeared at two leaf growth stage followed by S. graminum at the two tiller stage. M. dirhodum came later at the stem elongation stage. Aphid abundance differed among the species, wheat varieties and crop growth stages. The aphid species R. padi, wheat variety Duma and the flowering growth stage had the highest aphid population. The aphid species also differed in their points of colonisation. R. padi was most abundant on stems of wheat at seedlings, lower leaves, flag leaf and the spike as the crop matured. S. graminum mainly colonised the lower leaves. M. dirhodum was mainly on the underside of upper leaves including the flag leaf. The studies showed a crop growth stage and feeding site preferences among cereal aphids.