The protective measures as a tool to eliminate the gradations of bark beetles on Norway spruce in the Beskids

The target of this paper was to evaluate the protective measures against Ips typographus (L.). and Ips amitinus (Eichh.) in the conditions of the Forest districts: Jablunkov, Ostravice, Frydek Místek and Ro nov pod Radho těm (the Beskids) and the definition of factors that influence the efficiency of the protective measures in 1999--2009.The population of bark beetles gradates in the summit area of the Beskids only exceptionally. Therefore the protective measures do not influence the abundance of bark beetle population in a fundamental way. Outbreak of the bark beetles occurred in the lower altitudes of the Beskids, in the Forest district Jablunkov. The increase of the protective measures in 2008 and 2009 has contributed to the stop of the outbreak, and to the decrease of the size of the bark beetle population.