mystlw,
Here I found a lot of info on the leaf miner.
Sooby,
The leafminer was discovered in Florida in 2011(I am sure you already knew that) but that leads me to believe it would probably arrived here maybe a couple of years later. Not sure how fast and far that fly can travel. The plants that were infested with them might have traveled even faster.
Edited:
I read the leafminer was first discover in Florida in 2011, but that was the first in Florida, not the U.S.
