Abstract
The article is devoted to the problems of conservation of wild populations of the Sievers apple tree, which presents a valuable gene pool. Therefore, the study and conservation of this gene pool for the purpose of use in modern and future breeding, reforestation, and forest cultivation is an urgent task. The most powerful arrays of wild populations of the Sievers apple tree in Central Asia are currently preserved in Kazakhstan. They are of great importance as a natural source of the gene. It should be noted that, there are several threats affecting the condition of the Sievers apple tree, one of the main threats to the existence of wild populations of the Sievers apple tree in the last 20 years has become insect pests that cause huge damage to natural populations. In this regard, the purpose of the publication is to clarify the factors influencing the development of these pests, to determine phenological and ecological characteristics, to identify the most vulnerable stage of dominant pests for the application of timely measures to combat these pests of the Sievers apple tree. This article examines the phenology of three dominant pests, namely the apple ermine moth, the rose leafroller and the hawthorn leafroller. The results of the study activity of dominant moths were summarized, and a phenological calendar for the development of this pests has also been compiled. The results of the study of the features of the development of these pests are summarized. The article presents the compiled phenological calendars of three pests and the degree of occurrence and colonization of defoliating insects of the Sievers apple tree in the conditions of Iley Alatau.