One of seven dwarfs in half whiskey barrels. Doesn't look too bad right now; I should have taken the pics before trimming. But the problem is still visible: a necrotic-like withering. The removed leaves and stems looked almost black and were wilted and spongy. I've sprayed once with Daconil, then a week later with Bonide copper fungicide. When I first saw it, it looked like a serious and probably pernicious condition. I'm concerned about

spreading to other plants.

Any thoughts appreciated.

Gary