Wool Sower Gall

Backyard Something
This is attached to a lower branch of an oak tree in our backyard! Any ideas to what it may be? We live in Georgia near Atlanta.
Ralph W Sarc

Hi Ralph,
This is the second letter today requesting an ID for the Wool Sower Gall. We were sad the first had no photo and then we opened your letter. The Wool Sower Gall which is produced by a tiny wasp, Callirhytis seminator. Galls are growths on various parts of plants, usually caused by a Gall Wasp or a type of mite. There are many species of Gall Wasps, and each has a specific host plant. The oak tree is the host plant for the Wool Sower Gall.

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