Adaptive changes of life cycle, overwintering and spatialdistribution of spruce bark beetles(Ips typographus L. and Pityogenes chalcographus L.)in relation with dominant habitat conditions

When somebody speaking about bark beetles it is necessary to distinguish two differentapproaches. First one include bark beetles in category of a pests, and second one include barkbeetles in category of insects with important ecologic role in forests ecosystems. Eighttoothed spruce bark beetle (Ips typographus L.) and six toothed spruce bark beetle(Pityogenes chalcographus L.) are the most importa…