Hedgehog Galls

Why, they’re miniature Tribbles! This white oak has been hosting these structures for years now on its leaves. But this is the first time I’ve seen them so fresh. They’ll brown up over the summer.A tiny wasp, Acraspis erinacei, known as the Hedgehog Gall Wasp, creates these in conspiracy with the tree. Essentially the wasp hijacks the tree’s chemistry to protect its young. The tree is not harmed. Come the fall, females will emerge from these and lay their eggs on the oak’s buds. Those bud gall wasps will emerge next year and start the process all over again by moving to the leaf.

All the galls on the blog.

4 Responses to “Hedgehog Galls”

  1. 2 Pete Coombs July 13, 2022 at 7:31 am

    Found one yesterday in NW Sussex County, NJ. Have never observed them before – lived here 35+ years. (But I remember seeing brown galls later in the year, maybe ‘mature’ hedgehog galls?). Thanks for being here – learned something entirely new today!

    • 3 mthew July 14, 2022 at 5:41 pm

      Once you start looking at oaks, the galls will show themselves. The hedgehog galls do tend to brown/tan out into the fall, losing this wild red.

  1. 1 Galls Again | Backyard and Beyond Trackback on December 5, 2019 at 7:03 am

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