Well, I doubt that it’s caterpillars, unless they’re microscopic ones. I believe George might be on to something with the tissue damage point. The damage I see from google searches seems to have these white trails too, like these pictures. I don’t see these trails on my leaves however.
That mammoth canncontrol states it eliminates multiple things, so if George would also use it for leafminer control, then I know if I use it and the issue continues that it wasn’t leafminers AND it wasn’t any of the things the canncontrol treats.