Other photo.

Hi, could be a number of things from sun scald of the leaves perhaps to vitamin deficiency... that soil looks pretty dry... I can't really say. Have you fertilized? Do you water consistently? Ants like my bean plants too, as well as my sunflowers. Don't ask me why... no aphids from what I can see.

They don't look like they're dying -- and your harvest may not be affected by these leaf issues. I've had deer eat all the leaves off my bean plants, and they still sprouted new leaves and produced beans just fine. I do see a wilted leaf in the right of your squash photo -- is that another squash plant? Now THAT one looks like it's in trouble (hopefully it's just a weed you've pulled and let lie!)

Wait -- I just looked closer. Is that squash in a pot or in the ground? If it's in a pot, it may be stressed from not enough space (if that is a pot, it looks too small for the plant.)