One of my Atomic Grape plants has two floppy leaves mid high, on opposite sides. They look like they were cut off an hours ago. There is no physical damage, or any discoloration. They've looked identical all day. The rest of the plant looks healthy.

Should I be worried about Verticulum or Fusarium?

I dunno, my Atomic Grape gets leaves like that too, I think it might be just the way it is, Maglia Rosa is like that too. Did you check closely for aphids?

There is a small number of very small black aphids on most plants. Spraying doesn't help.

Yes, me too. One arm of my AG was wilting this week and the other not. It must have been because it was near the wall and the other unwilted branch wasn't. Later it was fine. I warned my son to always check the soil before watering this one because it can do this kind of wilting thing.

I get the tiny black aphids too but they die on the tomato plants and do no harm.

Heat stress? Notice any changes in the evening or before sun up?

They looked identical early this morning. I snapped them off just in case.