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Hairy oak gall - Andricus lasius

Hairy oak gall - Andricus lasius
Deer Springs trail, Idyllwild, Riverside County, California, USA
May 9, 2010
Size: 6mm diam.
Shows exit hole (probably from another insect) and exuvium from midge.

Images of this individual: tag all
Midge from hairy oak gall Hairy oak gall - Andricus lasius

Moved from Lasiopteridi.

Moved from Hairy Gall Wasp.

Moved from Gall Wasps.

Moved from Gall Midges. The midge must be an inquiline; this has to be a cynipid gall. Identifying the cynipid may lead to an ID of the midge... knowing the oak species would help a lot in identifying the cynipid.

Inquiline midge
Hi! According to Joyce Gross, the wasp is Andricus lasius, and the plant is Canyon Live Oak, Quercus chrysolepis

oak species
Peter -- actually I thought you were sure the species is Quercus chrysolepis (I had only commented on the common name). If you're not sure of the oak species, it would be good to post some other leaf pics. Most likely this is Quercus chrysolepis based on both the gall and what I can see of the leaf but if you have any uncertainties about it it would be good to post a photo of the underside of a leaf, and a whole leaf. It looks as if this leaf has some golden fuzz on it but I'm not sure.

I suspect the only way to get an ID on the midge will be to send the specimen to the USDA Systematic Entomology Lab. I'm sure Raymond Gagne, who works there and is the author of the book on gall midges, would be interested to see it since the host is known.

Wider view of leaf?
Following up on Charley's suggestion to identify the oak, do you have a photo with a wider view of the leaf (and maybe twig?), Peter? It might be possible to figure out the species from that photo, especially if you could also describe the habitat.

Moved from ID Request.

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