The preliminary studies were conducted in the years 2006-2008 at the Fruit Experimental Station of Wrocław University of Environmental and Life Sciences. One year old trees of Harcot, Hargrand and Bergeron cultivars grafted on Pumiselect® vegetative rootstock were planted in spring 2006, at a spacing of 4.0 x 3.2 m (780 trees∙ha-1). The experiment was established in a randomized block design in 4 replications with 3 (ʻBergeronʼ) or 4 (‘Harcot’, ‘Hargrand’) trees per plot. The trees of all estimated cultivars started cropping in the third year after planting but the obtained yields were not too high. ‘Harcot’ and ‘Bergeron’ produced only some fruits. The significantly highest crop per tree and largest fruit were recorded for ‘Hargrand’. ‘Bergeron’ trees produced clearly the smallest sized apricots. ‘Harcot’ proved to be the most vigorous cultivar. The weakest growth was noted for ‘Bergeron’. The highest per cent of dead trees was observed for ‘Hargrand’, the lowest one for ‘Harcot’. However ‘Harcot’ showed to be very susceptible to bark and wood diseases. ‘Bergeron’ fruits were very susceptible to peach scab.
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