Japanese Maple Trees

Tree bark problem

Zone Central Pa. | maddawgg added on September 12, 2012 | Answered

I have in my front yard a Locust tree, a flowering Dogwood and a Japanese maple. All three have the same bark disease. The bark is peeling and there is a spot on the Locust that looks as if it had a small explosion that pushed the bark outwards and left a hole the size of a golf ball. On all the trees there is what looks like a pale green patchy fungus. Can anyone tell me what is happening to my trees? Thank you

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Certified GKH Gardening Expert
Answered on September 14, 2012

The pale green fungus is lichen and is not harmful to the trees. Many people like the way lichen looks and are fine with it, but others find it unsightly. This article will help you with the lichen:

The other issues sound like you make have a canker disease. There are several kinds and diagnosing trees can be difficult without a physical examination. This article will explain more about cankers:

But, I would also recommend contacting your local extension office to see if they can send someone to help identify the exact type of canker disease or if they can recommend a local tree specialist that can help you.

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