Oak Tree Gulls
I'm not quite sure how to put the question, but I
will try my best. There are several oak trees in my back yard, I
think they are specifically pin oaks. They have formed on some of
the leaves green ball-like growths about an inch in size that
sometimes fall to the ground. They resemble miniature chinese
lanterns. The ball has a somewhat tough outer shell, almost like a
thin skin of a fruit. Inside the ball is a fibery like web of veins
and a small seed in the middle. I am trying to figure out what
exactly these things are and if they are harmful to my oak trees.
Sounds like oak galls caused by insects. The following should be helpful:
Anthony R. Brach, Ph.D.
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Update: June 2012