chalyse said:different from that of the systemic fungicides". Perhaps @sooby would be able to update, comment further, or explain if that would not have any helpful application after rust has already appeared (and whether it is a worse course to experiment than cutting back fully).
Sorry, no there was no continuation of the Guelph study. I'm not sure what to suggest to improve appearance. You can't reverse leaf damage that has already occurred so other than picking off the worst leaves or cutting back the plants so that they grow a fresh set (which one probably wouldn't want to do more than once) I can't think of much that would help. The drastic trimming pictured on my rust web site is aimed at new arrivals, to limit the risk of bringing rust in on new plants to a garden that doesn't already have it. One possibility, any fertilizer to encourage new growth should probably not be high N and should have adequate potassium as these, particularly the latter, may have an impact on rusts.
There's been no research that I know of as to how far daylily rust specifically can travel on the wind. Some other rusts' spores can travel considerable distances. Both times I introduced daylily rust to my garden deliberately it didn't move beyond the main bed where I started it. There were other daylilies about 100 feet or so down-wind but they remained rust free so this is something of an unknown at this point.
