Add Yahoo as a preferred source to see more of our stories on Google. A western pine beetle rests on a sap mound on a pine tree. - Charles Wollertz/Getty Images A thriving pine tree is a thing of ...

A Colorado nonprofit is working to help landowners fight back against growing infestations of mountain pine beetles and protect their properties from wildfires.

Colorado’s warm and dry winters have tipped the balance in a long-running ecological tug-of-war. The mountain pine beetles, native insects to the Centennial State, have recently exploded in numbers in ...

I think it is pine wilt disease. However, I do not want it to be pine wilt disease, so I brought in a couple of arborists. We ...

In 2002, Crater Lake National Park ecologist Michael Murray thought the park’s majestic whitebark pine trees were as good as gone. An invasive fungus called white pine blister rust was killing the ...