С. Н. Евдокименко The purpose of real researches was to identify the possibility of increasing the mass of fruits in the hybrid progeny of primocane raspberry and to establish the best parental pairs. The work was carried out in the natural and climatic conditions of the Bryansk region in 2017–2021, 13 cultivars and 7 selected raspberry forms of primocane type, 10 hybrid combinations of crossing with a total number of seedlings 658 pieces were included in the research. The experimental plants were placed according to the scheme 3.0 × 0.5 m, the normalization of stems in the bush and watering was not carried out. The evaluation of cultivars and selected forms, most often used in hybridization, revealed, that 75% of cultivar samples belonged to the group of large-fruited (3.5–5.0 g) and 25% – to very largefruited (>5.0 g). This indicates a high level of the trait in the modern assortment. The splitting of hybrids by berry mass even in the progeny of large-fruited primocane raspberry forms does not exclude the appearance of small-fruited seedlings, and low negative values of the degree of dominance (D = –2 and below) indicate a deep depression in the inheritance of the fruit mass in the progeny of large-fruited parents. However, the analysis of the hybrid progeny of large-fruited parental forms of primocane raspberry found that their breeding potential in increasing large-fruited has not been exhausted. In eight out of ten studied crossing combinations, 3.1 to 10.1% of transgressive seedlings with an average berry mass of 5.5–6.1 g were isolated. The combinations of parent pairs Podarok Kashinu × Atlant, 9–113–1 × Poklon Kazakovu, 9–113–1 × Podarok Kashinu, Poklon Kazakovu × Carame’lka, as well as populations from free pollination of forms 4–33–1 5–38–3, 3–164–1 are promising in obtaining very large-fruited selections.
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