Krex, I'm so sorry to have missed this post until now! This forum can be a bit slow, but the folks here are very good.

I think you've probably done just fine. I would not remove the plants. I'm not positive about some of that "rust." But the leaf farthest to the right has leaf miner damage. Those little bugs live inside the leaf. Removal of the leaf and destroying it away from the garden is generally the best thing to do. The color of the leaves, with the exception of that one, is good.

Rust, actually is the name of a condition, and this may be what your plants have. I haven't seen it for quite some time. But I suppose it is fairly common in some places. Take a look at the link below. It deals with Rust. Also, as I write, I am remembering something my father taught me when I was little. I do it to this day, though I seldom think about it. He always told me not to touch or even walk through our bean patch while the dew was on the leaves. Weeding while the leaves were damp was taboo. I believe the reason he gave me was that it could cause rust. I grew up in NJ in a humid climate.

Where do you live? What is your climate. Perhaps this might give us a better idea as to the cause of this problem.

George
Tahlequah, OK

Here is a link that might be useful: Rust on Bean leaves

Thank you for the follow up. I live in St. Louis, MO. We have humid summers, too. It has been an extremely wet month with drenching thunderstorms. I will make sure not to touch or weed the plants while wet. Since removing the leaves, I have not seen the brown coloration on them. However, some bugs have chewed holes in the leaves. They look like doilies! I sprayed them again with the insecticidal soap/fungicide. If I remove those damaged leaves, I won't have many left! I do have a couple of beans coming in as well. At what length should I harvest them?

Don't pick off those leaves. Though full of holes they still function.
Pick the pods anytime they are of usable size, but not yet tough. Conditions can affect how large they are before starting to get tough. So does the variety. Experiment, and you'll figure it out quickly.

Also, if you have the space, now would be a good time to plant some more, so that, when these wear out, you'll have more coming. Many bush beans only produce well for about 3 to 4 weeks.

George

Thanks, George. I believe I still have plenty of bean seeds. I will put them into the ground this week.