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What can I use to treat it or does that mean the tree is dying? I read it happens on decaying wood. Does this mean it is rotting or hollowing inside?

I have two large, beautiful mimosa trees in my front yard. One of them suddenly appears to have this brown, stringy stuff coming out of ends that had previously been cut. The brown stuff is leaving a residue on the grass below, and has a very fine powder... almost like cocoa powder.... when...