Some stands of aspen and cottonwood trees across northern Colorado and along the Front Range won’t be at their most picturesque this fall due to leaf spot diseases that benefitted from an unusually ...

While bark beetles have been slowly infesting trees in Aspen, winter won’t offer any respite. Aspen is currently home to the Douglas-fir beetle, the spruce beetle, the mountain pine beetle, Ips ...

It’s not just the lodgepole pines that are dying in the Colorado mountains. Thirteen percent of aspen trees in the state are now affected by Sudden Aspen Decline, which is caused by disease and ...

The city of Aspen forester wants residents to know many cottonwood leaves are turning brownish in color and dropping from the trees early this year. That is because they are suffering from marssonina ...