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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Ants, Bees, Wasps and Sawflies (Hymenoptera) » "Symphyta" - Sawflies, Horntails, and Wood Wasps » Common Sawflies (Tenthredinidae) » Nematinae » Willow Sawflies and allies (Nematini) » Pristiphora » Mountain Ash Sawfly (Pristiphora geniculata)
Photo#1392804
Mystery Larvae - Pristiphora geniculata
Copyright © 2017 Gwen LHirondelle

Mystery Larvae - Pristiphora geniculata
Squamish, British Columbia, Canada
June 27, 2017
I noticed several groups of these insects stripping the leaves from a small Mountain Ash tree in my yard. I have seen the stripped leaves in pervious years but this is the first time I have seen the insects. They were moving very quickly.
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Contributed by Gwen LHirondelle on 27 June, 2017 - 12:28pm
Last updated 27 June, 2017 - 7:14pm

Moved
Moved from ID Request.
… Charley Eiseman, 27 June, 2017 - 7:14pm login or register to post comments

Sawfly larvae
Determining what kind might require rearing them to adults--hostplants are unknown for most species.
… Charley Eiseman, 27 June, 2017 - 12:32pm login or register to post comments

 
i would place bets on...
Pristiphora geniculata
… metrioptera, 27 June, 2017 - 1:31pm login or register to post comments

 
Looks like it
Apparently it's only known from northeastern North America, but these introduced species have a way of popping up in the Pacific Northwest too.
… Charley Eiseman, 27 June, 2017 - 1:34pm login or register to post comments

 
Thanks.
Well - we are quite a distance from NE North America, so this is very interesting. I appreciate your help and the help from metrioptera with this ID. I just did a search with the name meprioptera provided and see that it is commonly known as the Mountain Ash Sawfly. Also, I found an article (Journal of Hymenoptera Research https://jhr.pensoft.net/article/7104/) that mentioned this species as newly-recorded in Washington State, along with 21 other Sawfly species not previously known in WA. Great call!
… Gwen LHirondelle, 27 June, 2017 - 7:04pm login or register to post comments

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