Questionwhat does it mean when sap bubbles out of a plum tree?
AnswerThere could be several reasons. One is a bacterial canker for which there is no cure. The other is that woodpeckers may be pecking on the trunk. Look for holes aligned in a row around the trunk. If you see these, then wood peckers are the problem. Usually they cause no significant damage. The tree can take a lot of this type of abuse. The third reason is some other wound to the trunk. Here again, there is really nothing that can be done. I hope all works out OK. Good Luck.