Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
which gall is this? - Andricus quercuscalifornicus

which gall is this? - Andricus quercuscalifornicus
Salem, Marion County, Oregon, USA
June 18, 2007
Size: 7cm at its widest
I found these galls on a young Oregon White Oak in our back yard

Made new species page & moved from Gall Wasps.

"Oak apple"
I believe this is an "oak apple" gall (or, rather, a pair of them), a type of "bullet gall" produced by cynipids.

apple gall
Boy! That was fast! Thank you
Michel Kleinbaum

oak apple
The scientific name is Andricus quercuscalifornicus, which occurs from southern Washington south to northern Mexico (per Ron Russo's book). It occurs on Oregon oak and other species of white oak.

These galls support quite a lot of insect life, not just the wasps that made the galls but others that are parasites or inquilines (live in the gall without killing the creator of the gall).

gall wasps
Thank you for this information
Michel Kleinbaum