OCCURRENCE OF DRYING PLUM TREES IN THE CULTIVAR CACANSKA RODNA, CACANSKA LEPOTICA AND VALJEVKA GRAFTED ON MYROBALAN

This paper shows results for production by plum cultivars ?a?anska Rodna, ?a?anska Lepotica and Valjevka growing in Polimlje production area. Cultivars are grafted onto myrobalan. The occurrence of tree drying in the examined cultivars was the highest in the first five years after planting, and sometimes after six years. The aboveground part dries first, while the rootstock remains alive and continues to produce sprouts. Further tree drying is not noted after six or more years. Based on the whole number of examined trees, 6.37% dried during examination, which is not negligible from an economic aspect. Because of seedling heterogeneity of the myrobalan rootstock used for grafting, it is necessary to choose specific biotypes for suitable cultivars, so that insufficient compatibility between cultivars and the rootstock can be avoided. Plum cultivars should be cultivated properly using good agrotechnical measures.