What's wrong with my poor oak tree?
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Douglas Hunt on Jun 14, 2013It sounds like they may be galls, which are caused by insects. See the description and more info here: http://hyg.ipm.illinois.edu/pastpest/200704g.htmlHelpful Reply
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Alissa Hoke on Jun 21, 2013Thank you. I believe you are right. The pictures in this article look just like what is on my tree. Unfortunately, my very large tree is covered in them. Sigh....Helpful Reply
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Douglas Hunt on Jun 22, 2013I don't think they are much of a threat to your tree, Alissa, however unsightly they may be.Helpful Reply
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