I lived in Pennsylvania near the initial impact zone when these first arrived, in south Jersey a few years later, and moved to new York city about a year ago. The fly is now present in all 3 of these and was when I lived in those spots, but what's interesting is the amount that I see them has decreased every time I visit back to any of these places, particularly in southeast Pennsylvania where I used to see them all the time.

Anyone know why this would be the case? State eradication efforts were in full tilt for about a year or two in 2019 when I saw them all the time in PA, so I'm guessing it's some kind of combination of new predators emerging or the population becoming less dense as it spread out?