Peculiarities of growth and fruitfulness of apple cultivars with genetic resistance to diseases grown under high density system.

The researches performed at the Research Station for Fruit Growing Voineti, in the period 2007-2012, had as object of study 13 disease-resistant apple tree cultivars in a high density system, grafted on M 9 rootstock, respectively: 'Ariwa', 'Golden Lasa', 'Goldrush', 'Enterprise', 'Inedit', 'Iris', 'Luca', 'Real', 'Rebra', 'Redix', 'Remar', 'Saturn', 'Voinicel', comparative with the 'Jonathan' cultivar, considered as control. The trees were planted at a distance of 4 x 1m (2.500 trees/Ha), spindle crown shape. With high production potential remarked the disease-resistant apple cultivars 'Ariwa', 'Remar', 'Inedit' and 'Saturn', which in the years 4 - 6 after planting realized over 29 t/ha. In the same conditions, the apple tree cultivar 'Real', 'Voinicel', 'Luca' and 'Iris' realized between 23,2 t/ha and 25,5 t/ha. The promotion of the high density apple tree system, in which disease-resistant apple tree cultivars are previewed, represents a modality for periodical and rapid replacement of the assortments, leading to the identification of new modern technologies in obtaining productions adapted to the requirements of the European quality standards.