July 12, 2022 at 12:52 pm Replybea.thuPrivate messageGreenhorn
There are a dozen of these small coin-sized marbles on my oak tree. Are they a fungus? Should I cut them off? They’re firmly attached to it I’m afraid of breaking the branches. It’s a small beauty oak near where I take my coffee. I’m curious as to what it really is!July 13, 2022 at 1:48 pm ReplyBumble BeePrivate messageGreenhorn
those sure look like galls – have you tried opening one? Slicing it open?October 14, 2022 at 11:05 am ReplyBlueBuzzardPrivate messageGreenhorn
Oak apple gall caused by gall wasp Biorrhiza pallida. The larvae live inside. galls will not seriously harm your tree. Personally I would leave them as they look kind of interesting.October 22, 2022 at 4:45 am Replybea.thuPrivate messageGreenhorn
That’s definitely it! Thanks @BlueBuzzard! They have a small hole in them now I think they must have emerged in the meantime.
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