EN
The purpose of the research was to assess the number of aphids in two different winter triticale genotypes. The effect of winter triticale genotypes mixtures was determined on the base of aphids’ number and percentage of infested plants. Field observations were performed on IHAR Radzików experimental plots in two seasons (2008 and 2009). The results presented here suggested that the aphid number and number of infested plants in mixture were lower than in pure stands. Waxy genotype (RAH 116−3/90) was more resistant to the cereal aphids than the wax-less genotype RAH 325/95. In addition, Sitobion avenae showed a higher level of studied population parameters then Rhopalosiphum padi on the triticale genotypes.