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Photo#1592305
Leaf miner, woodland borage

Leaf miner, woodland borage
Steve's Place, Fillmore County, Minnesota, USA
August 18, 2018
Host is a woodland borage (Boraginaceae) I didn't recognize...I think it might actually be Lithospermum latifolium, which is a state species of special concern in Wisconsin

Images of this individual: tag all
Leaf miner, woodland borage Leaf miner, woodland borage Leaf miner, woodland borage Leaf miner, woodland borage

It would be great if you can confirm the host...
The only literature record of a Nearctic leafminer on Lithospermum is a mine Spencer (1969) found on L. officinale in eastern Canada. It was described as dark greenish with central black frass (matching your mines), and was attributed to an undetermined Agromyza species but no adults were reared.

Just this year Jim Steffen reared an undescribed Calycomyza from L. latifolium, but its mine begins with a distinct linear portion.

 
After looking at my hostplant photos
B. Wernerehl (state botanist at at Massachusetts Natural Heritage & Endangered Species Program) writes, "It looks like Lithospermum latifolium. Nice find."

 
Thanks for the update
Definitely one to try (again) to rear when you get a chance.

 
Will do
It's not clear to me if any of the larvae in the leaves I collected were alive or if any of them pupated; I'll check the mines for puparia.

 
Host ID
Will reach out to my IA/MN/WI friends and ask them for help nailing down the host ID. Thanks for this info.

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