I've been pruning this tree since I was a teenager. It is a 55" American Elm. Awsome tree. Well lest year they were due for anoth injection but they decided not to. Our scout was out to check it out before we injected it this year and he saw some flagging. I bark traced it, found the streaking and it did stop about 15' before the main trunk, So we decided to inject it and remove the limb and hope for the best.