Mass propagations of invasive insects in forests
Some patterns of development of outbreaks of mass-breeding invasive herbivores who recently invaded the territory of Russia are considered. Examples are given of the penetration of certain invasive insects into the territory of Russia and the formation of their secondary rangess. Usually, these species are not considered dangerous pests in their natural habitats and they become dangerous only when they invade new territories. It is shown that the majority of the invasive species produce mass outbreaks virtually over the whole secondary ranges.