While beetles at low levels always exist on Grand Mesa National Forest, some foresters worry the area may be on the verge of a beetle disaster. “It’s at the edge of possibly blowing up and killing a lot of trees,” said forester Kitty Tattersall of the Paonia and Grand Valley ranger districts. “We’re worried it could become a problem.” Mostly, foresters are concerned about the spruce beetle, whose outbreaks are normally triggered by blowdowns. Last October, violent winds toppled trees near the Alexander Lake area on the mesa, creating the potential for a spruce beetle epidemic. Spruce beetles usually emerge...