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Home » Guide » Arthropods (Arthropoda) » Unidentified Tracks, Sign, and Other Mysteries » Unidentified Galls » Salix (willow) stem galls
Photo#484096
Stem gall in arroyo willow (Salix lasiolepis)
Copyright © 2011 John Callender

Stem gall in arroyo willow (Salix lasiolepis)
Carpinteria Salt Marsh, Santa Barbara County, California, USA
January 8, 2011
Size: ~1 cm long
This stem gall was on arroyo willow (Salix lasiolepis). Checking Russo's Field Guide to Plant Galls of California and Other Western States, the closest thing would seem to be Euura lasiolepis (Tenthredinidae, though we don't seem to have a genus page for Euura). The appearance of this gall doesn't quite match Russo's illustration; he shows an elongated gall rather than the shorter galls I found, but maybe that illustration is meant to illustrate the case where several galls are formed in a continuous string, while the galls I found today were separate?

See also this gall, which was nearby on the same tree:

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Contributed by John Callender on 8 January, 2011 - 11:07pm
Last updated 21 October, 2011 - 9:17am

Moved
Moved from Unidentified Galls.
… Charley Eiseman, 21 October, 2011 - 9:17am login or register to post comments

Moved
Moved from ID Request.
We don't have a page for Euura yet because swellings in willow stems could be made by Euura spp. (of which there are more than 25 in North America, probably not all covered in Ron Russo's book) or by midges (and smaller ones could be made by agromyzid flies too), and I haven't seen one yet that I'm 100% certain is caused by a sawfly. To be sure which is responsible, you'd need to either collect some and see what emerges, or cut them open (you could do this with old abandoned ones if you didn't want to kill the inhabitants; sawfly galls would have frass and empty cocoons inside; midge galls would not).
… Charley Eiseman, 14 January, 2011 - 6:50pm login or register to post comments

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