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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Ants, Bees, Wasps and Sawflies (Hymenoptera) » "Parasitica" - Parasitoid Wasps » Cynipoidea » Gall Wasps (Cynipidae) » Oak Gall Wasps (Cynipini) » Disholcaspis » Disholcaspis perniciosa
Photo#598216
Rough Oak Bullet Galls - Disholcaspis perniciosa
Copyright © 2011 Eric R. Eaton

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.
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Contributed by Eric R. Eaton on 29 November, 2011 - 11:34am
Last updated 22 February, 2023 - 6:14pm

Moved
Moved from Disholcaspis. Or maybe D. acetabula? Was the tree this was found on young and small or older?
… Joshua C'deBaca, 22 February, 2023 - 6:14pm login or register to post comments

 
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.
… Eric R. Eaton, 22 February, 2023 - 6:43pm login or register to post comments

 
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.
… Joshua C'deBaca, 22 February, 2023 - 8:13pm login or register to post comments

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