Maple Trees

Disease on Bark of Acers

jexley added on July 25, 2015 | Answered

White cotton wool-like small scales presenting on bark of our acers. Please advise of causes if pest and best treatments.

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Certified GKH Gardening Expert
Answered on July 27, 2015

This could be Mealybug, Wooly Aphid or a fungus.
Also sometime lichen can have a white appearance. Lichen is harmless to the tree.
I would treat with Neem Oil. It works as both an insecticide and fungicide so that you are treating both possible problems.

Here are some links for you.

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