Evaluation of biological and agronomical characteristics of development of late ripening local and introduced plum varieties regarding prolongation of fruits preservation, as well as using treatment with local BAP Reglalg, calcium and microelements during vegetation. Studied 4 varieties (Stanley and President -introduced, Udlinenaia and Super President-local ones (created at the Moldovan Institute of Fruit Trees Growing), which are grafted on Myrobalan seedling rootstock. growing in Plum National collection of Res. Inst of Horticulture, Chisinau, as well as in industrial orchards of plum producers of different Pomological Zones of Rep. of Moldova. There are utilized approved pomological and breeding methodology. Flowering begins in the second part of April, and it lasts for 7 - 10 days, earliest-Super President, the latest -Udlinenaia. Fruit ripening extended from late August to the midle of September. Comparing the years of studies, it can be concluded, that the differences in the time of maturity for the same varieties were not big (6 -10 days). The average fruit yield for President and Stanley was 47.4-78.1, 50,9-65,4 as well as 45,0-65,0 and 57,0 60,0 kg per tree for Super President and Udlinenaia. But the last ones there are distingueshed by high eating qualities of fresh and processed fruits, being proposed for organic production. The weight and size of fruit are the most important indicators of plum fruit quality. All studied cultivars could be classified like plums with large fruit size. The weight of fruit ranged from 63.4 g (Udlinenaia) to 40,52g. The Udlinenaia and Stanley varieties contain the biggest contents of soluble dry substance - respectively 23,10%, and 18,40%. The contents of total sugars in the cultivars varied from 14.70% (Stenley) to 11,83% (Udlinenaia). Taking into account, the best features among studied varieties preliminary were found that President, Stanley, Super President and Udlinenaia varieties there are fruits, with good capacities for long time preservation into controlled conditions. It should be noticed that BAP Reglalg, calcium and microelements, two time applicated (conc. 0,5mg) during intensive development of leaves and fruits have favorable influence regarding differentiation of floral buds, pollination and fruits set, resistance to specific for plum disease and pests, as well as to the formation of weight and fruits qualities. Studied varieties had very good properties and could be very interesting for further promotion. Actually, in the context of harmonization of the conditions of Moldovan export of fresh fruits with EU, plums, traditionally cultivated within all pomological zones, including different level of production, enlargement of late ripening varieties there is very indispensable