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Photo#231744
Oak gall final color stage. - Andricus quercusstrobilanus

Oak gall final color stage. - Andricus quercusstrobilanus
Hillside, Cook County, Illinois, USA
September 16, 2008
Size: 8-10 cm
This gall goes through a color change from the original red/pink to yellow and finally brown.

Images of this individual: tag all
Oak gall, remains of egg sites. - Andricus quercusstrobilanus Oak gall final color stage. - Andricus quercusstrobilanus Oak gall cross section. - Andricus quercusstrobilanus Oak gall with larva. - Andricus quercusstrobilanus

size...
...should be the size of the gall or gall mass or larva

gall development
Per an email from Jim, the photos above show later stages of the galls in these photos:

(Someone else posted the original two photos for Jim.)

Galls
Have your tried slicing open some galls to get a view of the bug? That would be a nice addition.

 
Only larva.
One of the original 3 photos and 2 of those above show cross sections. The early cross section shows a small spot where the egg/larva is(to small to tell). The others show a mature gall that fell from the tree. One of these shows a larva inside. The people I've communicated with who know much more then I do about this wasp don't expect the adults to appear until spring or summer next year. I collected a few galls and am keeping them in hopes of finding out what the adults look like. Hopefull I have them in the correct environment so they will continue to develope. If luck comes my way, I'll post images of the adults some time later next year.

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