This is an old thread, but I am actively looking for rust-resistant cultivars, so I thought I'd revive it.
So far, in my hot and humid southern garden, the daylily cultivars that haven't shown any rust at all are
South Seas
Siloam Double Classic
Cosmopolitan
Swedish Girl
Bitsy
Victorian Princess
Something
May May
Laura Harwood
Whatchamacallit
Bahama Butterscotch
Country Fair Winds
Lemonn Vista (unregistered)
Most of my daylilies have had some rust. Some got it right away. Others got a little but after being cut back seemed to recover. I've made a list of some I'm going to get rid of and others that are on probation.
I have several new ones that have so far not gotten any rust, but it's too early to tell.
