ACHIEVEMENTS IN CREATING NEW PLUM VARIETIES IN ROMANIA
As a matter of fact, native varieties have predominated always in the Romanian plum orchards, out of which Tuleu gras, Gras românesc and Vinete românesti (Bistritene) have an important place.
Although they bear high quality fruits, these varieties have some shortcomings as well. Thus, Tuleu gras is not enough resistant to frost and has poor-angled crotches, resulting in a slight branch breakage under the weight of the crop; Gras românesc has clinging stone, shallow rooting and poor resistance to drought; Vinete românesti is extremely susceptible to Polystigma rubrum Pers. D.C.
That is why during the first stage of plum breeding (1950–1959) the main task was to breed these varieties, by crossing them with foreign ones as: Anna Späth, Pêche, Abbaye d'Arton, Quetsche d'Italie, Agen, Kirke, Montfort and others, which have the already mentioned shortcomings in a less degree than the native varieties (N.Constantinescu, 1951).