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Rust on Phaseolus beans is caused by the fungus Uromyces appendiculatus. It is unrelated to broad bean rust, which is caused by the fungus Uromyces viciae-fabae and infects Vicia beans.
Keeping this in consideration, how do you keep a bean from rusting?
Some other ways to prevent rust spots on bean plants are: Properly spacing plants to allow for air flow and prevent infected plant tissues from rubbing against other plants. Watering bean plants with a slow trickle directly at the root zone of the plant. Splashing water can spread fungal spores.
One may also ask, what is bean rust?
Bean Rust. Rust is a common disease that affects many plants. Bean rust is caused by Uromyces phaseoli typica, and it affects common dry and snap, lima, and scarlet runner beans. It is a worldwide disease, and can destroy an entire crop if conditions are favorable early in the season.
You should avoid eating beans with rust. Rust is caused by a fungus and as the disease progresses, wounds deepen into the bean thus creating an opening for other pathogens to enter. The beans in your photo should be discarded.