Pruning is a set of precisely defined operations aimed at crown training and controlling fruit tree growth and productivity. Since all cultural practices are basically aimed at the formation and development of buds, the engagement of the skilled labour in pruning is an important factor in better utilisation of biological potential of cultivars with differing types of organogenesis of bearing wood. Studies on the effect of quality of winter pruning on the biological productivity in apple cultivars. Idared, Jonagold and Melrose grown on the M 9 rootstock and trained as slender spindle, at the same level of production investment, showed that yields obtained by applying proper operations, by highly-skilled operators, were higher by 21.14% than those achieved by the less qualified workers. Also, the yield per tree variation was significantly lower with highly-skilled workmen, whereas with insufficiently qualified those it w as at the level of partial alternate bearing.