@Douglas-The tree just keep having saps oozing out all over. It just does not look like a healthy tree, like the ones I've seen around. I know mesquite barks peel a little, but when a whole chunk separated from the trunk with the saps oozing like crazy, something is not right with it.
@Cyndia-Thanks for the tip. I'll try what Cathy Bishof said. Unfortunately about the pruning, we kind of did some already. I guess we better stop. I thought cutting off the dead branches near the bottom will help.
@Sharon-Me too. I'm a treehugger and I really hope it can be saved.