Currently, a large and valuable material has been obtained in the field of physiological and biochemical studies, to study the biological features of the formation of flower buds and agricultural engineering systems that provide annual fruiting. The task of the author of this brochure: to summarize and possibly more fully present this material; give a critical analysis of the current main directions in the study of the causes of periodic and conditions of annual fruiting of apple trees, as well as in the development of agricultural equipment that eliminates the frequency of fruiting in it.