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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Flies (Diptera) » "Acalyptratae" » Tephritoidea » Fruit Flies (Tephritidae) » Trypetinae » Carpomyini » Carpomyina » Rhagoletis
Photo#1014636
Maggots in black walnut husk - Rhagoletis
Copyright © 2014 Peter Chen 2.0

Maggots in black walnut husk - Rhagoletis
Downers Grove, DuPage County, Illinois, USA
October 27, 2014
Size: ~5mm
Rhagoletis sp.?
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Contributed by Peter Chen 2.0 on 28 October, 2014 - 6:08pm
Last updated 1 December, 2014 - 9:24am

Moved
Moved from ID Request.
… Charley Eiseman, 1 December, 2014 - 9:24am login or register to post comments

Yes - Walnut Husk Maggot…
See reference here.
… Ross Hill, 28 October, 2014 - 6:39pm login or register to post comments

 
Thanks.
R. suavis, not completa? How do you distinguish the larvae?
… Peter Chen 2.0, 28 October, 2014 - 11:21pm login or register to post comments

 
Don't need to…
As far as I know, R.completa is not currently present in Illinois. It is a problem, however, here in Oregon, where nearly all of the walnut trees are infested to some degree.
… Ross Hill, 29 October, 2014 - 1:45am login or register to post comments

 
Good point.
The range maps for R.completa in the Guide don't yet include IL. However, the Forest Service page says "The walnut husk fly and the walnut husk maggot both occur commonly throughout central United States.", and its lead author is from IL. Also surprised at the general sketchy data of adults, and none of larvae, of either species.
… Peter Chen 2.0, 29 October, 2014 - 9:18pm login or register to post comments

 
Reference…
If you're really interested in distinguishing the differences between the larvae of these two species, there is a reference here. Good luck with that. It might be easier to just image an adult, and submit it to BugGuide if you have difficulty with the ID. You're not likely to see both species on the same tree at the same time.
… Ross Hill, 29 October, 2014 - 10:25pm login or register to post comments

 
Thanks for the link to a larva key.
Don't know what are the "slits" discussed there, so no luck. Imaging an adult is easier said than done; I have never seen one in the wild. Will attempt to overwinter some maggots/pupae and see who emerge next year.
… Peter Chen 2.0, 30 October, 2014 - 5:27pm login or register to post comments

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