Disease on Bark of Acers

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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1 Comment To "Disease on Bark of Acers"

#1 Comment By Downtoearthdigs On 07/27/2015 @ 1:40 pm

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.

https://www.gardeningknowhow.com/plant-problems/pests/insects/woolly-aphid-control.htm ^[1]
https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm ^[2]
https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-bark-disease.htm ^[3]
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm ^[4]

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URLs in this post:

[1] https://www.gardeningknowhow.com/plant-problems/pests/insects/woolly-aphid-control.htm: https://www.gardeningknowhow.com/plant-problems/pests/insects/woolly-aphid-control.htm

[2] https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm: https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm

[3] https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-bark-disease.htm: https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-bark-disease.htm

[4] https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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