Hi All, I need some help with a tree problem that I'm having here at my own home. What's happened is the bark on 2 mature trees started splitting & they have mysteriously died. Now I have 3rd tree that has started splitting it's bark so I'm trying to find out what causes this and how to stop it before it kills this tree or spread to other trees on my place. Here are some photos. Any tree guru's out there that have a clue as to what causes this & how to stop or prevent it?