The paper presents the results obtained in monitoring eight apple-tree cultivars (Ionagold, Ionathan, Starkrimson, Goldspur, Idared, Prima, Florina and Generos) in competition culture aimed at selecting some genetically disease-resistant cultivars. As a result of numerous phonological observations concerning trunk width/diameter, productivity, chemical composition, as well as disease resistance/behavior, four resistant cultivars have been recommended for organic farming (Idared, Goldspur, Generos and Ionagold).