Mystery mine on American trailplant (Adenocaulon bicolor)

Here's a mystery I've been trying to solve for a decade now: a long, linear leaf mine of an agromyzid fly on Adenocaulon bicolor in the Pacific Northwest. It should be a relatively easy one to rear, since the puparium is formed in the leaf (hidden on the lower surface) and there are apparently at least two generations per year, with mines present from June to October.

photo of agromyzid mine in an American trailplant leaf @jmole, WA, 6/9/2021

photo of agromyzid mine in an American trailplant leaf @lumenal, OR, 7/6/2021

photo of agromyzid mine in an American trailplant leaf @lumenal, OR, 7/12/2022

photo of agromyzid mine in an American trailplant leaf @lumenal, OR, 7/18/2022

photo of agromyzid mine in an American trailplant leaf @flammulated, OR, 7/22/2021

photo of agromyzid mine in an American trailplant leaf @flammulated, OR, 7/30/2021

photo of agromyzid mine in an American trailplant leaf @brnhn, WA, 8/18/2022

photo of agromyzid mine in an American trailplant leaf @kurtsteinbach, WA, 8/30/2021

photo of agromyzid mine in an American trailplant leaf @brnhn, OR, 9/5/2021

photo of agromyzid mine in an American trailplant leaf @johndreynolds, BC, 9/18/2020

Posted on October 14, 2022 03:40 PM by ceiseman ceiseman

Comments

They're active now in Oregon! https://www.inaturalist.org/observations/163545932
@cosmopterix, maybe you can keep an eye out...

Posted by ceiseman 10 months ago

Indeed! I remember searching for this years ago. Unfortunately our abundant populations of the host before the fire haven’t yet rebounded, so I am unlikely to encounter this casually. Next year I’ll be out and around more.

Posted by cosmopterix 10 months ago

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