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What Are These?

Posted by bikerdoc5968 6 SE MI (My Page) on
Thu, Oct 3, 13 at 12:36

This year my very old oak had not produced any acorns. I know acorn production varies year over year, but this year NOT ONE! Instead, these fury little irregular balls are falling in huge numbers on a daily basis. They are green inside and soft. What are they? Some kind of insect infestation... I can't believe they are aborted acorns.

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RE: What Are These?

Those are a type of leaf gall called a fuzzy oak gall. This gall is caused by a teensy wasp...the wasp larva develops inside the gall, feeding on it as it grows into an adult wasp.

These galls are not considered at all harmful to the tree.

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