The bad news? All of those dead ash trees are a very real safety threat. Ash trees impacted by ash borers die because the larva of the bugs live under the bark of the tree and hinder its ability to carry water and nutrients up the tree. The trees die from the bottom up. Which means large, fully mature trees that have good, solid wood up top will have a stump that's crumbly and rotten. And that, folks, is the recipe for a woods loaded with widow-makers.