Decline of Western Aspen trees swells population of rodents that carry the deadly sin nombre virus

As noted in prior posts, Aspen trees in the West have been dying. There appears to be no single cause. However, drought in the 1990's and early 2000's probably made the trees more susceptible to cankers, fungi, and other maladies. The result is that some sites have lost as much as 2/3 or more...