EN
Results presented in the paper suggest that chemical compounds which occur within epicuticular waxes of the waxy winter triticale genotype RAH 122 play an important role during feeding behaviour of the bird cherry-oat aphid Rhopalosiphum padi. The EPG (electrical penetration graphs) recordings showed that aphids feeding on the waxy genotype of triticale spent more time on non-probing than on wax-less RAH 366. The EPG recordings confirmed the results of entomological tests, where the waxy genotype prolonged the aphid development time and reduced their fecundity. Summing up the epicuticular wax compounds clearly affected feeding behavior of the bird cherry-oat aphid, thus waxy triticale genotypes might be useful in controlling this cereal pest.