Oak Galls

gall1The mighty oaks and their galls are an endless source of curiosity. This particular type, a hard, fruit-like structure, is created by a tiny wasp, which essentially irritated the tree into making them for their larva.
galls2Clever boots! The trees are Swamp White Oak (Q. bicolor), according to the Street Tree Map. (I’m waiting on some leaves to see if I can confirm that.)gall3The wasp’s exit hole. I think these are Disholcaspis genus gall wasps. D. quercusmamma perhaps? (Why, yes, a translation of that would be “oak breasts.”)

2 Responses to “Oak Galls”


  1. 1 Paul Lamb March 6, 2017 at 6:06 am

    Is that an exit hole or the bore hole of a predator? I’ve seen both descriptions.

    • 2 mthew March 6, 2017 at 6:50 am

      I think it’s an exit hole, based on some other photos I’ve seen, but you raise a very good ? Larva are delicious, evidently… A parasitic wasp is probably an option, too.


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