Sugar Pine Dies (IMAGE) University of Washington Caption An old-growth sugar pine in the Sierra Nevada Range in California dies after a bark beetle attack. Warmer temperatures that reduce snow pack, prolong drought and favors insects could be affecting trees. Credit Jerry Franklin/University of Washington Usage Restrictions Photo credit required 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.