So I picked this guy up at a nursery. Did the first prune on it, and noticed some brown in the center of some branches thay I cut off. I posted a pic of the worst one I saw, it was a knot that I carved away from the main trunk, and the brown spot in the middle is the darkest of all the spots that were on the tree. So is this rot? Something else? And if it is rot what do I do? On a tree this big, would the rot eventually take over the tree and kill it or would it have a chance of surviving? Or should I just cut it off as close to the base as I can get until I cant see any brown?