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Oak leaf pest id

Anyone know what this is and if I need to be concerned? Just finished building a leaf mulch cave and noticed a few leaves had this on them.
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done!
Oak leaf spangle gall, caused by a wasp. Willnot harm the tree. We had a load last year, and a bumper crop of acorns this year.
http://en.wikipedia.org/wiki/Neuroterus_quercusbaccarum
Thanks