Question: We have a can of spray foam that says it can be used to fill cavities in tree trunks. There's a hole in one of our trees where a branch was removed -- it's about waist-high. The hole extends ...

QUESTION: We have a healthy live oak that has developed a small pocket where two limbs come together. Water collects in the cavity, and it looks as if the area is starting to rot. Should I fill it ...

Question: I have a multi-trunk Albizia julibrissin that is 7 to 8 years old. It started out with five trunks, but one died off the first year and another was growing out of the center and slowly got ...

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: My poplar tree has a decay cavity in the base of the trunk. My arborist says I should have it cleaned out and filled with concrete. Will draining the cavity and stopping water from entering stop ...