Forest Dieback (IMAGE) University of Würzburg Caption Spruces killed by bark beetles on the Lusen in the Bavarian Forest National Park in Germany. Ecologists call for preserving most of that dead wood in forests. Credit Simon Thorn / University of Wuerzburg Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.