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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.

trunk bark wood

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Looks like two sorts of lichens; generally regarded as harmless to the tree. I have not yet found any reports showing them to be bad for trees.

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The two lichens I'm spotting here are Xanthoria Parietina and Foliose lichen. They are harmless and very common to find on tree branches.

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  • Do you have any suggestions for other things I should be looking at as to why they have hardly any leaves? – DJClayworth Jul 4 at 21:23
  • The reasons that come to my mind are: proper pruning, extreme temperature changes, soil quality, watering, other pests. The leaves from your picture seemed undisturbed so I don't think you have a pest problem. – Drosera capensis Jul 5 at 17:11

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