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Photo#1439440
Agromyzidae, midrib and petiole miner, heart-leaved aster - Ophiomyia

Agromyzidae, midrib and petiole miner, heart-leaved aster - Ophiomyia
Winneshiek County, Iowa, USA
August 23, 2017
On heart-leaved aster, Symphyotrichum sp. Mines midrib and petiole, causing discoloration that often seems to resemble scarring rather than leaf-mining, and is typically (in my brief experience with this creature thus far) more visible on the underside of the leaf. I have found specimens in several different populations of the host plant in my area.

It appears the puparium overwinters in the leaf petiole.

Unlike a couple other midrib and petiole internal feeders I have been tracking and attempting to rear lately, this animal does not appear usually to venture into the leaf axil or plant stem.

Ruler units are sixteenths of an inch

Other examples (from 2019):

Images of this individual: tag all
Agromyzidae, midrib and petiole miner, heart-leaved aster - Ophiomyia Agromyzidae, midrib miner, heart-leaved aster - Ophiomyia Agromyzidae, midrib miner, heart-leaved aster - Ophiomyia Agromyzidae, midrib miner, heart-leaved aster - Ophiomyia Agromyzidae, midrib miner, heart-leaved aster - Ophiomyia Agromyzidae, midrib miner, heart-leaved aster - Ophiomyia Agromyzidae, midrib miner, heart-leaved aster - Ophiomyia

Discoloration
Are these mines typically associated with yellowing of the leaf blade as in this example?

 
Would you like to examine
two examples of this petiole miner? Just collected yesterday, and each leaf petiole appears to have a puparium inside it. Would be happy to send them to you (and I bet you'd have a better chance than I of overwintering the puparia).

 
I'd love to, thanks!
And I'll keep an eye out for them around here too.
I've been finding a good number of Ophiomyia stem miners on Nabalus/Prenanthes lately, with and without "scabs." Also just found a mine at the base of a horseweed stem (white puparium, unfortunately already empty).

 
Great, will send
Glad to hear you've been finding stem miners on your Prenanthes...and on horseweed too, wow! That's definitely not one I've seen before; will have to watch for that here.

 
Not sure
I recall finding them in late summer / fall when the leaves were starting to senesce anyway, which made it unclear if the discoloration of the blade was related to the mining.

Moved
Moved from Leaf Miner Flies.

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