Currently, I have one 1980's Daylily that is struggling. It Rusted severely, so I have moved it to
a brighter drier spot to see what that would do. The other 1980's Daylilies I had Got Rust and Died.
Unlike many, I think that Rust can kill a Daylily plant, but I am not sure if it does so directly or does
so indirectly by weakening the plant to the point opportunistic pests finish the job.