Abstract
The current task in the study of Malus sieversii is the balanced use and protection, conservation, reforestation of the vegetation cover. Malus sieversii is a valuable gene pool on the territory of the State National Natural Park «Tarbagatai», therefore, the study, preservation of its form diversity is necessary for modern and future breeding, reforestation, afforestation. In order to preserve Malus sieversii in its original form, phenological monitoring of environmental, anthropogenic, natural and climatic factors of conditions affecting it is carried out and studied. An important role in increasing the productivity, quality and sustainability of Malus sieversii plantings is played by methods of conducting phenological monitoring control throughout the year, for many years.