My mother grew daylilies just 50 miles from here from 1948 to her death in 2001, and never ever had any afflicted with spring sickness. In fact I had never heard of it until I ordered some new ones, and one of the "freebies" turned out to have spring sickness. Then it spread to the two on either side. I have taken out the first two afflicted and will be taking out the third. I believe this can spread, so I will simply remove any that become affected, because I don't want this in my garden. I will not replant new daylilies where the affected ones were taken out. I will put something else in there instead.