| Summary: | Strawberry aphid, Chaetosiphon fragaefolii (Cockerell), is the most important vector ofstrawberry virus. Breeding of genotypes resistant to this pest is an important preventivecontrol measure, which can be compatible with rational insecticide application. The aimof the paper was to determine effects of dimethoate and deltamethrin on C. fragaefoliipopulations reared on two strawberry genotypes different in susceptibility: susceptiblestrawberry cultivar Čačanska rana and medium resistant hybrid, zf/1/94/96 (Senga Fructarinax Del Norte). Lower toxicity of deltamethrin was observed (laboratory assay) as well aslower biological efficacy of dimethoate at lower concentrations (field trial) for specimensfrom C. fragaefolii population reared on susceptible strawberry cultivar Čačanska rana.
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