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Under the conditions of the field experiment, which was set up in apple trees of 'Prima' cultivar on the M9 rootstock (Kuban horticultural zone, soil -leached chernozem), it was found that physiologically active substances melafen and follytol used 40-45 days before harvesting initiate a change (compared with the control) in the dynamics of plant growth. At the same time, the growth process is activated against the background of the critical high temperatures during the summer period and is attenuated in time in the conditions of abnormally warm weather during the autumn months. These patterns are associated with the optimization of apple plants generative development in adjacent seasons.

In natural plantations of common hazel in the NorthWest Caucasus, the most common leaves are oval and obovate, having weak degree of dissection, pointed apex, heart-shaped base, smooth or rough surface, light green or green; more rare are elliptic, ovoid, obovate and oblong, undifferentiated, with a rounded base, red or golden-yellow shades. On the basis of the law of parallelism, a prediction is made about the presence of forms with established morphological features of leaves, and in the field, rare individuals with leaves of golden-yellow and red tint are identified.

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