What is on my silver maple leaves?

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67HEAVEN Northumberland Cty, ON(Zone 5b) Jul 08, 2015

This is a young 6-foot silver maple tree. Some of the leaves have these strange blight(?) on them. Red spots on the underside of the leaves, but showing through as dark bumps on the top of the leaves.

Any ideas? Thanks.

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Post #10108194
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Diana_K Contra Costa County, CA(Zone 9b) Jul 09, 2015

Those are galls.

http://ento.psu.edu/extension/factsheets/leaf-galls-maple

Post #10108894
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67HEAVEN Northumberland Cty, ON(Zone 5b) Jul 14, 2015

Thanks very much.

Post #10111286
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