Pin Oak Infestation
Name: Lisa W.
I have several pin oaks that have bare branches. On
these bare branches are circular brown balls about 2.5 inches in
diameter and it appears to be killing the trees. I broke one open and
there were tiny insects and grubs inside. Do you know what this is, will
it destroy the trees, and is there a way to get rid of them?
You found some insect galls.
Anthony R. Brach, Ph.D.
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Update: June 2012