Green evergreen trees surrounding a patch of brown trees

During periods of extended drought, pine trees become water-stressed, and beetles can get the upper hand. Infested trees needles' fade from green to reddish-brown. In central Idaho and eastern Oregon and Washington, vast mountain areas have already been transformed by mountain pine beetle infestations, wildfires, or both.

Public domain photo by U.S. Forest Service. Learn more about bark beetles »

Last modified
29 March 2022 - 7:44pm