Aktywność mszycy zbożowej (Sitobion avenae) oraz czeremchowo-zbożowej (Rhopalosiphum padi) w procesie żerowania mszyc na sztucznych pożywkach z ekstraktami wosków powierzchniowych

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Summary Electrical Penetration Graphs (EPG) were used to monitor the feeding behaviour of cereal aphids exposed to the surface waxes in artificial diets. The EPG patterns generated by aphids feeding on plants were used to interpret the patterns generated on the artificial diets. The surface waxes from waxy genotype (RAH 122) completely stopped salivation (as indicated by EPG pattern p-E1), passive and active ingestion (as indicated by pattern p-E2 and pattern p-G) and also delayed the onset of stylet activity (EPG pattern p-C). The surface waxes from waxless genotype (RAH 366) applied into the artificial diets prolonged the period of stylet activity in the diet (pattern p-C), passive ingestion of the diet (pattern p-E2), reduced non-probing (pattern p-np) and active ingestion of the diet (pattern p-G). Results presented in the paper suggest that chemical compounds which occur within epicuticular waxes of the waxy genotype (RAH 122) and waxless genotype (RAH 366) play an important role during feeding behaviour of the grain aphid and bird cherry-oat aphid. Summing up the epicuticular wax compounds clearly affected feeding behavior of the cereal aphids, thus waxy triticale genotype might be useful for limiting the population of cereal pest.