Climate change, voracious beetles and disease are imperiling the long-term survival of a high-elevation pine tree that’s a key source of food for some grizzly bears and found across the West,… ...

The whitebark pine is a hardy tree that grows in an area stretching from British Columbia, Canada south to parts of California and east to Montana. It's a keystone species in its subalpine and ...

An insect known for turning entire mountainsides the color of rust could be making a resurgence in Colorado. The pest is none other than the mountain pine beetle. After a roughly decade-long ...

Once it gets into a tree, the nematode spreads through the trunk, branches, and roots. It feeds on the cells lining the pine’s resin canals, causing resin to leak into other vessels that carry ...

“The driving factor (in the tree’s decline) is that white pine blister rust, and that’s working synergistically with mountain pine beetle, the altered fire regime, climate change,” Abbott ...

“The driving factor (in the tree’s decline) is that white pine blister rust, and that’s working synergistically with mountain pine beetle, the altered fire regime, climate change,” Abbott ...

US officials say climate change, beetles and a deadly fungus are imperiling the long-term survival of a high-elevation pine tree that's a key source of food for some threatened grizzly bears.

“The driving factor (in the tree’s decline) is that white pine blister rust, and that’s working synergistically with mountain pine beetle, the altered fire regime, climate change,” Abbott ...

“The driving factor (in the tree’s decline) is that white pine blister rust, and that’s working synergistically with mountain pine beetle, the altered fire regime, climate change,” Abbott ...

“The driving factor (in the tree’s decline) is that white pine blister rust, and that’s working synergistically with mountain pine beetle, the altered fire regime, climate change,” Abbott ...