Analysis of the development of grafted grape seedlings on a school of different graft-rootstock combinations

The increased demand of industrial viticulture for grafted grape seedlings is associated with a number of factors, the main of which is the ubiquity of phylloxera. The introduction of new highly productive varieties into production requires research on the selection of the optimal rootstock variety. In this connection, in 2019–2020, experiments were conducted in the fields of the FSBSI ARRIVandW – branch of the FRASC for the experimental determination of phenotypic signs of compatibility of graft-rootstock combinations with the participation of graft grape varieties of interspecific origin Denisovsky and Prestige and root-stock varieties Kober 5 BB and Riparia Rupestris 101-14, entered in the State Register of Breeding Achievements of the Russian Federation, approved for use. According to the results of the conducted re-search, we can make a preliminary conclusion that the selection of optimal graft-rootstock varieties for growing the necessary graft varieties has a direct impact on the yield of seedlings, which, with the same level of agricultural technology, will minimize production costs for grafting seedlings and repairing grape plantations. The influence of the rootstock variety on the phenotypic characteristics of the graft variety was established. The yield of seedlings is the most objective indicator of the compatibility of the scion-rootstock combination. Based on the results of research in 2019–2020. it is established that the yield of first-class seedlings of the Denisovsky and Prestige varieties significantly depends on the rootstock variety used. On the rootstock of Riparia Rupestris 101-14, the highest yield of seedlings of the Denisovsky variety is 45.4 %, which is 21.6 % more than on the rootstock variety Kober 5 BB. On the Denisovsky variety, the yield of seedlings was 48.0 %, which is 39.9 % more than on the Kober 5 BB rootstock variety.