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The results of the study of winter-hardiness of the varieties and forms of filbert (Сorylus domestica Кosenko еt Оpalko), planted in Ukraine, are presented. The aim was to determine the suitableness of filbert plants for industrial planting in the gardening zone of Ukraine that needed the most exact assessment of potential of their winter and frost resistance. For attaining this aim we introduced in the research the laboratory freezing of tissues and organs of prospective varieties of filbert with modeling of influence of the low negative temperatures at the level - 25, - 30 and - 35 °С. As the material of research were used the filbert plants of varieties and forms, prospective for planting in Ukrainian conditions. The study and procurement of slip material was carried out in parent filbert plants of decennial age of research-productive district of the National dendrologic part “Sofiivka”, NAS of Ukraine during 2015–2016 according to conventional methods and recommendations. Incomplete coincidence of the data of frost resistance of studied filbert variants in the natural conditions and at the different modes of direct freezing can be explained by the varietal features. Despite the unfavorable conditions of wintering 2015–2016, the freezing of studied filbert plants under the garden conditions was completely insufficient (summary point of damage was less 10) and insufficient (the level of disorder is limited by 11–20 points). Besides the ability to endure the short-term strong frosts, the high winter-hardiness is demonstrated only by filbert plants, less sensitive to the provoking influence of thaw. The complex assessment of the winter and frost resistance of filbert plants by the field and instrumental methods proved the sufficient adaptability of studied samples to the conditions of studied gardening zone. The varieties and forms of filbert Sofiiivsky-1 and especially Pavlenko’s gift were recognized as the best by the frost resistance and potential of winter-hardiness.

THE WINTER-HARDINESS OF THE VARIETIES AND FORMS OF FILBERT (CORYLUS DOMESTICA KOSENKO ET OPALKO), PLANTED IN UKRAINE