Tsupko S. Peculiarities of biology and selective value of distant hybrids of nectarines and peaches with almond

Object: The peculiarities of drought-resistance, field resistance to fungal diseases, the terms of flowering and ripening, productivity, quality and chemical composition of fruits. Aim: biological peculiarities and economically-useful characteristics of distant hybrids and selection of elite forms for use in breeding and production. Methods: field, laboratory, statistical. Novelty: For the first time, based on the study of biological peculiarities and complex evaluation of economically useful characteristics of 48 hybrids, the level of their adaptation during growth and development in the South of Ukraine has been determined. On the basis of phenological researches and study of flower buds morfogenesis, the level of winter and frost resistance of hybrid forms has been determined. The peculiarities of drought-resistance, field resistance to fungal diseases, the terms of flowering and ripening, productivity, quality and chemical composition of fruits have been established. Results: 13 forms with valuable characteristics features which can be used in breeding programs have been selected. Forms 629-89 and 631-89 are recommended for production testing as rootstocks for peaches and nectarines. Application stage: Materials of the thesis submitted for further study and production test in 5 breeding and production organizations in Ukraine. Application area: breeding institutions.