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Home » Guide » Arthropods (Arthropoda) » Unidentified Tracks, Sign, and Other Mysteries » Unidentified Galls » Artemisia vulgaris (mugwort) stem swellings
Photo#729173
Galls on Artemesia vulgaris -- Common Mugwort
Copyright © 2012 Link M. Davis

Galls on Artemesia vulgaris -- Common Mugwort
Oaks, Montgomery County, Pennsylvania, USA
December 8, 2012
Size: 1.5 cm in diameter
I believe this is an image of two galls on Common Mugwort -- Artemesia vulgaris. I found a similar image from Thomas of Baltimore on your site. The link is below. Can you tell me what insect may have caused these galls?

http://bugguide.net/node/view/579955
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Contributed by Link M. Davis on 9 December, 2012 - 8:07am
Last updated 9 December, 2012 - 9:49am

Moved
Moved from ID Request.
… Charley Eiseman, 9 December, 2012 - 9:49am login or register to post comments

It appears that there are no known galls on mugwort
although there a large number of galls on western Artemisia spp. (sagebrush). Simple stem swellings like this on other plants are often caused by midges in the genus Neolasioptera. It would be great if you could collect some of these and see if anything emerges, or at least cut some open and examine/photograph the contents. If you find midge larvae inside, I can put you in touch with a specialist who could identify them.
… Charley Eiseman, 9 December, 2012 - 8:50am login or register to post comments

 
Galls on Mugwort
Hello Charley,

Thanks for the quick response. I will see what I can do with getting more of the galls. I will let you know how it turns out.

Thanks for your time,

Link
… Link M. Davis, 9 December, 2012 - 9:39am login or register to post comments

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