I ordered plants last year that were unknowingly infected with rust. It broke out in full force in several spots of my garden before I realized what it was.
I read many articles about treating it, but finally decided to just cut everything that was affected. I dug up the rusty plants (in my naivety, I did not quarantine them before planting into the regular bed area) that started it, and put them in pots away from all other plants. Before potting, I carefully stripped each leaf away from the crown, then cut the rest of the nub right at the crown. I cut these off a second time several weeks later when they exhibited rust again, but not as severe of a cut.
For my older, established plants, I just took shears and cut them off down to the ground. I only cut the ones that were affected, so the garden looked quite weird and awful. Since it was the fall of the year, this was enough to stop it from spreading before it got out of hand.
I have been on the lookout for it this year, and thankfully it hasn't shown up.
