Rust rating is sure complicated. I agree with everything here.
I won't treat any of my daylilies for rust though. I garden organically, so as Pat suggested ... if some of them remain rust buckets next year, they will be culled. I do like to keep at least a couple rust buckets in each garden bed for exposure to the other daylilies. In all honesty, so far, I haven't seen too many "5" ratings so far among my daylilies. Lots of 3 ratings. But also a surprising number of "1" and "2" ratings. I hope they continue to show resistance next year. And I am crossing the "1" and "2" rating plants with all the others. Unfortunately, most of my "1" and "2" are spider daylilies. I do have quite a few still yet to bloom, so who knows what the new ones will look like. I am seeing resistance on many plant's foliage so far, too.
Sue - I don't know what else those lesions on the baby leaves might be? What else could make those marks. I ran a tissue along the bottom of the leaves and no rust. So you are probably correct that it isn't rust. What else it could be, I don't know. It is on several of the leaves of that seedling and it's siblings in the same cup.
