Ian wrote:

I have a few trees (maple, ash) that need some branches pruned as they are
either dead or hanging too low.

Need I apply something to the trunk of the tree to cover the cuts after I
have removed the branches, such as shellac?

Thx

If you prune limbs carefully to the branch collar, there is no need to coat
the cut with anything - the tree will scar over and seal the wound on its own.
Painting pruning cuts is no longer considered a sound gardening practice - it
can actually increase problems for the tree and delay natural healing.

pam - gardengal