I have no problem getting rust on my small seedlings, I dont have to introduce it
Tim Herrington is the only person I know that truely breeds and is somewhat successful in weeding out the rust.
I have no problem killing rust, but once the plants get it, I have never found a way to really save the leaves and make the plant look decent. It just has to start from scratch. Once it gets over 90, no problem. Im going to have to try some of the things mentioned above.