Bark Beetle on the Colville National Forest

The Mountain Pine Beetle is at epidemic levels throughout the western United States and in parts of Canada.  While we have not seen the extreme  levels of infestation here in eastern Washington, concern about the epidemic is growing and the Forest Service has had requests for information on the insect’s impact here on the Colville National Forest.   We feel that the documents listed should help answer most questions at both a local scale and a regional scale. 

Aerial Insect and Disease Detection Surveys

In 2016 and on the Colville National Forest, the bark beetles were mapped. The majority of the damage was attributed to the mountain pine beetles, and mortality in the ponderosas, douglas-firs, and true firs were also observed. Unlike the rest of the region, spruce budworm defoliation continued into 2016 and affected a similar number of acres as of last year.

The map has red and yellow polygons, which denotes defoliators and agents. The yellow polygons are defoliators, mostly western spruce budworm, and the red polygons are other agents, mostly bark beetles. To view more detailed information, place the cursor on a polygon and click on it. A box with more specific information will populate. The information will include acreage, aerial survey damage code, damage agent names (up to 3 agents can be recorded), trees per acre affected by each agent, and the total number of damaged trees. Not all of the trees in the polygon are dead.

Please click on map to view the 2016 Aerial Survey Update.

Image showing Bark Beetle Mortality
Other Damage
Not Flown
National Forest


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