This maple was kept in an unheated garage over winter and about a month ago I brought it upstairs into an unheated solarium where it grew new leaves and seemed healthy.
Suddenly (possibly after a cold spell)
All its leaves wilted.
All my other maples are okay it's just this one .
It also seems to have developed some black growth near the bottom trunk.
Is there any hope?
It's a twombly's red sentinel