FIELD: horticulture, in particular, multiplication of fruit culture plant material. SUBSTANCE: method involves providing plants, rooted during growing period, prior to settled frosts; storing plants till they are completely frozen through in freezing chamber; making cut in zone of formation of additional roots; considering the extent of injure to separate plant tissues by conventional coefficient expressed in numbers and concluding rootage frost resistance. EFFECT: increased efficiency by reduced time consumed for determination of apple tree clonal rootstock frost resistance. 2 tbl, 1 ex
