I have a pair of lilacs, very close together, which have been fine for ten years. This year they have hardly any leaves (just patches of them) and what appears to be a whiteish and partly yellowish mold on the trunks. It looks like some kind of mold disease.
Can anyone identify the disease and tell me what I should do? Or are they only fit to be cut down.
I have other lilacs on the other side of the house that are fine. This is in Southern Ontario.