Silver Maple - something on the leaves?

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Ashful

Minister of Fire
Mar 7, 2012
20,075
Philadelphia
Anyone know if these seed or egg things appearing on the leaves of the lowest branches on my Silver Maples is friend or foe?

[Hearth.com] Silver Maple - something on the leaves?


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Looks like leaf galls. If so they are generally not harmful.
 
I was thinking tar spots as they start out yellow as well ... fungal in nature. (broken link removed to http://www.greenlivingonline.com/article/fix-black-spots-maple-leaves) But they are raised aren't they!
 
Yep, raised. I think begreen nailed it.


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