Rust is a fungal infection. I don't know what fungicides you have available in the USA. failing that lift and burn the diseased plants. don't leave any fallen leaves on the soil as the rust spores will over winter in the soil and re infect plants next year.

which plants are affected as some plants are more susceptible to Rust than others?

Also, rust fungus is pretty specific in its diet: each species of rust has one, or just a few specific hosts that it infects.