well, this is a new one for me. Looked at the underside of some branches on several maples and found a nasty surprise. The branches looked they have been filleted from the underside. Brittle even though leaves look fine. Definitely going to be some big time dieback and probably some lost. I assume this is some sort of sunscorch as we are in the midst of a nasty heatwave and the worst damage is in areas that receive the most afternoon sun (but actually little wind). The things that surprises me are: 1) the damage is on the underside, not the sun exposed side 2) We have hot summers every year here in st. louis, but this is the first I have seen of this (although I have only grown JMs for 4 years) 3) little leaf burn Any thoughts? Suggestions?