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After enormous amount of ice rain during 2014. huge damage was done in forest in Croatia, especially in the city ?abar area. Result of ice rain damaged forests is wide spread of bark beetle. To prevent further spread of bark beetles infected trees should be cut down. In huge forest area great problem is to detect areas with infected trees. Main characteristics of bark beetle damage is change of treetop color. Treetop color depends on the stage of infection and it goes from green to yellow and to red. Optimal perio...