Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Photo#366306
Gall on oak - Disholcaspis quercusglobulus

Gall on oak - Disholcaspis quercusglobulus
Groton, Middlesex County, Massachusetts, USA
January 22, 2010

Moved
Moved from Unidentified Galls.

 
Round Bullet Gall
Charley, the texture on this one was quite different than the other Round Bullet Galls, that were nice and smooth. I've got a few of each of the galls in containers, and hope to see what comes out of them.

 
Texture
Yes, a meant to add a note about that. There don't seem to be any other known galls that that this matches, so it's been my assumption that these rough red ones are a variation on the smooth yellowish kind, which we can call Round Bullet Galls with more confidence. I look forward to seeing what comes out--be sure to keep specimens, since I doubt anyone will be able to ID them from images. Also note that cynipids often wait two or more years before emerging, so don't throw your apparent "duds" away! I think the bullet gall wasps are supposed to emerge in the fall, so we may have to wait until next fall for these.

 
That's a long wait
I'm glad you told me that it could take over a year to emerge, otherwise I might have tossed them too early.

 
Some more info...
I've now reared two of these Ormyrus sp. parasitoids from stunted, reddish Disholcaspis quercusglobulus galls:

...So it seems that parasitism may explain the difference in the appearance of the galls. This more recent one was clustered with a regular (much larger, smooth, yellowish brown) D. quercusglobulus gall, so I know that's what it was.