Forest is an invaluable wealth, a habitat for animals, birds, and other living beings. However, like any living organism, it is not protected from factors such as diseases and forest pests that can cause significant damage. Trees may die as a result of damage caused by forest pests and diseases. Due to the conditions that developed in 2017, the population of the common pine sawfly increased sharply, leading to damage to pine forests over large areas. The most severe damage was observed in young forests, where repeated defoliation caused tree crowns to dry out.