Bark beetle-infested spruce trees begin to dry out already before any visible signs of tree mortality appear, a recent study from the University of Eastern Finland shows.

For spruces, the greatest future risk of mortality is posed by the European spruce bark beetle (Ips typographus), whose population sizes, reproductive rates and generation numbers are rapidly growing ...

From harmless to aggressive The European spruce bark beetle usually does not attack healthy trees. Most of the time, it lays eggs and reproduces in dying spruce trees or fresh timber. However ...