Daylily cultivars vary in their susceptibility to daylily rust, so not all will get much in the way of spots even in an infected garden. The problem we have is the huge number of daylily cultivars in circulation, which makes it difficult to get reliable ratings for rust resistance for any particular cultivar one might be looking to buy. There are ratings for cultivars here in the NGA daylily database but the ones where only NGA input is taken into account only reflect one person's observations which may or may not indicate genetic resistance/susceptibility so much as environmental influence on the level of disease. There are hybridizers who are working on breeding daylilies resistant to rust, though.
