Complex evaluation of the introduction prospects for Hulthemia hybrid roses planted in the National Dendrological Park “Sofiyivka” of the NAS of Ukraine

Abstract

Aims. The theoretical and experimental substantiation of the introduction of the rose's Hybrid Hulthemia to the environmental conditions of the Right Bank Forest- Steppe Zone of Ukraine. Methods. Biometrical, comparative-morphological, and statistical ones. Results. Viability, growth and development indices, as well as ornamental qualities (tolerance for winter conditions, frost hardiness, drought resistance, complex disease and pest resistance, habit maintenance, flowering, coloration, shape of flowers etc.) were analyzed for two rose cultivars, Hybrid Hulthemia. Research was done within a 2017 to 2024 on the NDP "Sofiyivka" introduction and exhibition plots, as well as on farms that used planting material. Evaluation of the prospects of introduction showed that the studied cultivars have a score of 28 and 30 points of 50, and they were of little prospect for the introduction to the conditions of the Right-Bank Forest-Steppe Zone of Ukraine. The acclimatization number for the studied cultivars was 38 points of 100, that is, these plants were not sufficiently adapted to the natural and climatic conditions of the Right-Bank Forest- Steppe of Ukraine. The total evaluation of ornamental qualities of roses Hybrid Hulthemia made 58 and 65 points of 100, which means that these cultivars exhibited low decorativeness. Conclusions. The roses of the studied cultivars Hybrid Hulthemia tested in the natural and climatic conditions of the Right-Bank Forest- Steppe of Ukraine, do not deserve further introduction into mass production. At the same time, given the active breeding work being carried out in the world aimed at obtaining resistant cultivars, the author considers it advisable to further conduct introductory research on new cultivars Hybrid Hulthemia.