Cambioxylophagous fauna of blue spruce (Picea pungens Engelmann) in the Kru né hory Mts. (Czech Republic)

In stands of blue spruce (Picea pungens Engelm.) established in the air-polluted area of the Kru né hory Mts. (Ore Mts.) in the 80s of the 20th century, basic cambioxylophagous fauna was defined on standing "bark beetle" trees. Out of eight determined species of cambioxylophages, Dendroctonus micans (Kug.), Ips amitinus (Eich.) and Pityogenes chalcographus (L.) demonstrated decisive effects on the mortality of blue spruce. Through realized tending measures, the actual dieback of particular trees or groups of trees can induce the gradation environment with changes in the health condition and increasing age of blue spruce stands.