From a publication (University of Mass) CORRECTIVE ACTION IS: 1. Rotate bean with non-host crops. 2.Plow under infected crop residues. 3.Eliminate volunteer bean plants. 4.Select planting dates and schedule irrigation to avoid long periods of leaf wetness when temperatures are warm. 5.Disinfect poles in production of pole beans. 5.Avoid over application of nitrogen and ensure adequate potassium fertilization. 6.Plant resistant cultivars. ==> your issue is the rust sort of creates these pustules that allow the rust to survive over winter, or during crop rotations. You need to ensure you dig the old plants deep into the soil, clean your equipment (poles, garden gloves etc.). I would be inclined to use SULPHUR -- "Sulphur Dust Fungicide and Miticide" is usually what it is called. This dust can be sprinkled all over, on the plants etc. or can be mixed with water and sprayed. Also avoid planting beans in areas of "stagnant air" the plants need to be able to dry out -- in other words water on the plants (moist leaves and stems) are great breeding grounds for your rust. It's actually not a difficult problem to resolve, once you know what needs to be done -- remove and bury infected leaves, and/or sprinkle with sulphur dust, mitigate moisture retention (get the air flow going -- maybe you change up the arrangement of planting so the air flows through the plants and whisks away the moisture.

- Faith Celeste Archer