I live in northern Michigan and never seen rust on daylies. I wouldn't even know what to look for, except from photos of daylilies with it. We have a sandy, well drained soil in my area. The iris's and daylilies seem to thrive here and never had a problem with rot with either. I do get rust occasionally on some of my apple trees that I spray for. I don't know if that is the same or if it is tranferrable to daylilies? It never has.
