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Photo#1727441
River birch leaf mines - Profenusa thomsoni

River birch leaf mines - Profenusa thomsoni
Pine Brook, Isanti County, Minnesota, USA
September 13, 2019
Upper surface front lit. Mines much less evident on front-lit underside view (not shown). Uppermost left to lowermost right mine 'field' about 7 cm. Further search turned up no other leaves mined in such pattern. The tree is a good-sized planting. No native river birch known anywhere nearby (for seventy or more miles?).

Images of this individual: tag all
River birch leaf mines - Profenusa thomsoni River birch leaf mines - Profenusa thomsoni

Moved
Moved from Amber-marked Birch Leaf Miner.

Not sure why that move registered twice... this is one of five Palearctic sawflies that are introduced in North America; I think none are very particular about what birch species they use, although this seems to be the first record of P. thomsoni from river birch.

 
Thank you!
Thank you!

Moved

Moved for expert attention
Moved from ID Request.

These are nice images, you will probably get at least a ballpark ID.
You could try rearing them as well, but I am guessing based on season and your location they would overwinter before emerging as adults.

 
Thanks! As of now they are st
Thanks! As of now they are still feeding.

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