According to the Convention on Biological Diversity, it is necessary not only to protect the native flora, but also to prevent the settlement of alien species. This is especially important for specially protected natural areas. The Polistovo-Lovat bog system, the largest in the European part of Russia, is protected by two reserves – Polistovsky in the Pskov region and Rdeisky in Novgorod. The author of the article has been monitoring the introduction of alien species in both territories for more than 20 years. By now three species of invasive plants have been noted in the Polistovsky Reserve: Impatiens glandulifera Royle, Epilobium adenocaulon Hausskn., Erigeron canadensis Michx., and 12 species in the territory of its protected area. Amelanchier spicata (Lam.) C. Koch, E. adenocaulon were recorded in the territory of the Rdeisky reserve and 4 species – in its protected area. The most widely distributed are I. glandulifera, E. adenocaulon, E. canadensis. Heraculum sosnowskyi Manden. grows near protected areas.

E.O. Korolkova