THE CHANGE IN THE DENSITY OF PESTS FOCI IN IRKUTSK REGION
This article describes the dynamics of foci of pests over ten years in the forestry of Irkutsk region. Reduction of the foci area damaged by the Siberian lasiocampidae was the result of a sharp decrease in the number of insects in the autumn-winter period of 2003 - 2004 in Taishet and Zalarinskiy forest districts due to early-spring frosts, as well as the entomophages effect on caterpillars. The high density of pests foci was registered in 2013 (2.235), and low - in 2006 (0.233). In 2015, the maximum density of mass reproduction of pests was obsrved in Cheremkhovo (46.86) forestry, and the minimum - in Bayanday forestry (0.01). The density of the foci compared to 2014 decreased by 0.4 hectares per 1000 hectares of forested area.