We have lost one large sugar maple and several others in the same vicinity appear to be dying as well. Last year a fairly large sugar maple (16" diameter) began looking sick in early spring and by late summer lost all leaves. Now 2 much larger sugar maples trees adjacent to that one have large branches whose leaves began to wilt shortly after leafing out and now those branches appear dead - this appears to be quickly spreading through those trees. We just cut one of those branches down - about 8" in diameter - see attached photos. Does this appear to be sapstreak disease? We started to do a better job watering the trees - are there any other options?