New rootstock hybrids with Vitis cinerea and their resistance to phylloxera and callus formation

The phylloxera resistance of 13 rootstock hybrids containing Vitis cinerea in their pedigrees was evaluated in a pot experiment, and their capabilities to form post-grafting callus after grafting with scions of the 'Riesling' cultivar were evaluated. In the pot experiment, evaluation indicated that fully 11 of the studied hybrids showed very good resistance to phylloxera gallicoles. Visual evaluation of calluses was performed after stratification, and the highest percentage of grafted plants with a ring-shaped callus was observed in hybrids 17-1-6 (78.57%), 9-20-1 (61.29%), and 17-6-7 (42.86%). Hybrids 17-1-6 and 17-6-7 resulted from the Binova × Börner crossing, while hybrid 9-20-1 was the result of the Teleki 5C × Börner crossing.