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Rough Oak Bullet Galls - Disholcaspis perniciosa

Rough Oak Bullet Galls - Disholcaspis perniciosa
New Santa Fe Trail, Monument, El Paso County, Colorado, USA
November 28, 2011
Galls on Gambel's Oak (aka "Shin Oak"), Quercus gambelii at nearly 7,000 ft. elev. According to the online catalog of Hymenoptera, three species of Disholcaspis create this kind of gall on this species of tree in Colorado: D. cinerosa, D. perniciosa, and D. rubens. The trees were either gall-free or nearly so, or were heavily afflicted, like this specimen.

Moved from Disholcaspis. Or maybe D. acetabula? Was the tree this was found on young and small or older?

I do not recall.
Oaks along the Front Range (only Gambel's Oak there as far as I know) typically do not grow much beyond shrub size, so I have no idea how old it was. Sorry.

Thanks for answering
Thats no problem, I'm still confident on the ID. D. acetabula is supposed to only grow at the base of young plants, being a root gall, and these galls appear to be growing on a twig, so D. perniciosa is very likely.

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