Hi
@bobjax
There's a lot of scientific information available about daylilies that were tested for performance with Rust, and also some for Spring Sickness. Keep in mind that a rating of "resistant" does not mean a cultivar will not get these diseases. "Resistant" only means that they were observed to get 50% or less of their foliage affected, and thus performed well enough to be considered acceptable garden and helpful breeding specimens. Resistant cultivars were seen to self-recover without any treatment and were found to be presentable for garden display with foliage trimmed to remove (and carefully discard) affected leaves.
As for Ruby Clare Mims, it has two "grandparents" that were tested, which you can see in the Garden.org database by clicking back through a cultivar's database entry for its parentage:
Daylily (Hemerocallis 'Ruby Clare Mims')
In this case, all of its "grandparents" have rust info:
Royal Renaissance (Ed Brown 1.3 x Enchanting Esmerelda [shows suseptibility])
Red Friday (Startle 2.0 x Fortune's Dearest 2.3)
So there are both one susceptible and three resistant plants that it was hybridized down from. Even though you may see rust, it may well be able to recover. If you find it has more than 50% affected leaves and does not recover on its own, you can update the entry in the database to "shows susceptibility," or if less that 50% rust and does recover then "shows resistance." You can ask the Garden.org or daylily Forum Moderator for instruction on how to do that.
Also, if you want to search for more cultivar rust performance scores you can select for these averaged Rust rankings in the Garden.org database. Or, you can search for all ranked cultivars in the Search by Characteristics page in the same Garden.org database.
https://garden.org/plants/grou...
More information about the sources of the rust scores is here.
https://garden.org/barn/notes/...
Lastly, scores for daylily cultivars that were evaluated for Spring Sickness/Leaf Streak are linked at the bottom of the post shown: here.
The thread "For Plant Admins - Daylily Leaf Streak Data is Available" in
Plant Database forum (scroll up on that page to see)
Hope this helps, and that your Ruby Clare Mims recovers!