The bark on young grand fir trees is smooth and covered in resin blisters and white spots, becoming more furrowed over time. Both noble and grand firs are considered subalpine, but the grand fir ...

Another bark beetle epidemic has begun. In Colorado, white fir’s natural range is in southern Colorado; it includes the San Juan Range, the Sangre de Cristo Range, the very southern end of the ...

As of 2012, however, the less virulent western balsam bark beetle was the primary offender throughout White River National Forest. Douglas-fir beetles have also spread at lower altitudes, particularly ...

He noticed a couple of years ago that Douglas fir bark beetles were really gaining ground in the Roaring Fork Valley. The primary problem is that the ongoing drought weakens the trees. The beetles ...