Hi all,

Is there a formal way to determine how bad a tree cavity is?

I have a gorgeous tree on my backyard, probably a hundred year old. I
needed to do some pruning, so I invited a few different people for an
estimate. It turned out the tree has a cavity at the base of the
trunk. One person strongly suggests to remove the tree, since it may
be dangerous -- the tree is huge. The others say it's not too bad.
The tree looks perfectly healthy othewise.

All of them do their evaluation by just looking at the tree. What I
am wonderig -- is there any formal test that can determine how bad the
problem is?

Thanks in advance