Q. What does Cornell recommend doing with cavities in trees? Should I fill them? Should the tree be taken down? — Patrick, Grahamsville A. The most common causes of cavities are improper pruning, ...

Q: I have a tree that appears to be doing well but which has a couple hollowed-out branch stubs. Should I fill them in so it doesn’t cause problems? A: No, leave them as-is unless a certified arborist ...