
Liz Baessler
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on July 31, 2017
Do they look like the acorns on this page?
http://www.notcot.com/archives/2013/08/gall-wasp.php
You might have knopper galls, a symptom of a certain kind of wasp. There are actually wasp larvae growing inside the acorns. It may look really weird, but the presence of the galls won't harm the tree.
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