Anyone?

The brown spots look like heat stress.

They also look like they could use some fertilizer.

Well, I don't know but don't go crazy adding fertilizer, that isn't the main problem nor the cure. Has it been wet the past week, maybe too wet? Been very heavy rainfall and humidity in Ohio and surrounding area.

Bean rust? Have you been handling your beans while they are wet? That will often be all it takes.

I agree with rust. I've learned to stay away from the garden if the plants are wet, moist, slightly damp, etc. Just walking down a row can spread "whatever" or damage vulnerable leaves. I take a quart plastic container (chinese soup carry out) with a mild bleach/water solution when I prune tomatos, dip pruners and my hands in it as I move from plant to plant. Think about it, how often, other than harvest, do you touch your veggies?

That looks less like rust and more like sun/wind damage, to me. I do agree that the plants look to be a little deficient in something though. How does the new growth look? Odd that only half of your plants would be affected if it's environmental.

Thanks. They have been wet lately from watering. I guess I should water close to the ground and not a "rain effect". I'll cut the bad leaves off and hope they survive. Thanks again.