Tarnavska K. Biological features and economic value of Ukrainian apple clones (Malus domestica Borkh.) of the Jonagold variety in the conditions of the Western forest-steppe of Ukraine.

In the dissertation the evaluation results of biological peculiarities and economic value of 20 Ukrainian spontaneous clones (the Jonagold variety) in Western forest-steppe of Ukraine are presented, which showed that plants of most clones on the substrate MM.106 by parameters belong to the medium-growing. The clones of the DP-14 and the DP-18 were the most adapted to Western Forest-steppe of Ukraine. ). Plants of the clones DP-6, DP-12, DP-13, DP-14, DP-15 and DP-17 displayed the complex resistance to pathogens. All spontaneous clones are triploids, forming low-viability pollen (4-7%). The plants of the DP-14 clone were found to have the highest transplantation rate. The highest yields at the age of "growth and fruiting" formed plants DP-1, DP-7, DP-15, DP-17, DP-18 and DP-19. The high marketability, the most attractive appearance, the best taste qualities of fruits and economic efficiency of fruit production were allocated clones DP-1, DP-3, DP-17, DP-18, DP-19. Prospects for registration in the State Register of Plants ..., as suitable for distribution to the Forest-Steppe of Ukraine, recognized clones DP-14, DP-17, DP-18 and DP-19, for use in breeding as a source of certain features - DP-3, DP-5, DP-8, DP-11, DP-13, DP-14, DP-16, DP-17, DP-18 and DP-20.