Oh no I have rust on my green beans!

I am sad to learn that the leaves of your lovely green bean plants are Rusting. Hope that the Rust on the leaves of your plants had already been removed after spraying the rust remover. I did have the same experience that happened on the leaves of my flower plant. Luckily I discovered the problem in the earlier stage and found that there was only a few leaves were affected. I removed the Rusted leaves immediately so as to prevent it from spreading. I believe the white powder-like stuffs on the leaves probably are tiny fungus or harmful pests which will attack and kill the plants eventually. I was told that a mixture of copper sulphate and lime could be an effective fungicide.