Blue Lake Bean problems

[sewhoo]

I have 4 plants, planted back to back with a fence for climbing between them, 1 of the plants has curled leaves, but no sign of aphids. . I have looked for help online, but everything points to aphids, which I can NOT find on any leaves.

[imafan26]

Actually the damage I see could possibly be from broad mites and you would need a magnifying glass to see them.

https://entnemdept.ufl.edu/creatures/orn/broad_mite.htm