It looks like rust. I got rust on my beans a few years ago when I planted Kentucky Wonder. I have since switched to a bean recommended by the University extension. Poamoho beans. It has better disease resistance and is still a good productive bean. You may want to contact the extension in your area to see if they have a variety to recommend. Otherwise, the recommendation would be to destroy the infested plants and not plant beans in the same spot for about 2 years. Fungicides usually work better as prevention than cure.
https://www.extension.umn.edu/distributi ... g6144.html
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