I had been eyeing the foliage on 'Great White', it was looking like rust. With a few days in a row of rain and high eighties temps. it became an outbreak. I removed every leaf from it. I left the scape on it because it had a pod. Now 'Magnificent Rainbow' is starting to get rust, I removed several leaves from it, and may have to remove them all. Both of these plants show a rating in the threes and
Shows Susceptibility. Being both of these plants are new to the garden, and with them being known to show rust I was not surprised. The thing is that it often seems no matter where the daylilies come from, and no matter what the rating (normally not so much with 1.0) but even them sometimes, the first year in the garden they seem to develop rust. Then for some reason it seems to often go away or at least not be so bad. I was really enjoying getting this far along in the season (past peak time now here) with no rust.
I know the northern growers often don't like to buy southern plants because of a fear of rust. But it also seems to me that daylilies either have built up some resistant in their home garden to the strains of rust there, but then when shipped to a new location and are faced with a new strain of rust, they become susceptible. I have no hopes or dreams of ever doing away with rust in my garden, it seems that nature will pretty well dictate how much rust will affect my garden each year. At least the new plants are all pretty much isolated in a bed to themselves this year, that has not been the case most years. It was more by accident than planning, but I am liking how it worked out.

Larry, I'm hardly ever glad for the freezing winters here, but I really do like the fact that rust is not an issue for me.. I'm sorry to hear you had to rip all the foliage off of Great White- that's a task I would be pretty growly about...

I can't even imagine. It has to be hard dealing with rust. So sorry.

I have some rusty looking leaves here, but don't think its rust, its been such a wet spring. But all of the plants showing this have wintered over here at least one winter if not more.

I hybridize for rust resistant plants, but have used 1 rusty parent in a cross in hopes of capturing good features that plant has; rusty seedlings will be culled.

Last winter we had enough below freezing days to clear rust out for awhile here in zone 9a, but it now has come back as a different strain, I think.

Here rust flourishes in temperatures below about 82 degrees. When it starts to get hot here, rust subsides, so it is only an issue in spring and fall. Fall rust isn't as bad because humidity is usually not as high as in spring.
I got tired of spraying so no longer do it. I'm sorting through plants to keep only rust resistant ones.

When plants are moved, they are stressed and are more prone to show rust. I'm currently seeing some results from using mirate of potash around plants that tend to rust. This of course, is not a scientific study.

When plants are moved, they are stressed and are more prone to show rust. I'm currently seeing some results from using mirate of potash around plants that tend to rust. This of course, is not a scientific study

There is scientific evidence that adequate potassium helps reduce the severity of rusts in general, though.

I am so glad rust is not an issue here. I have heard rust is more of a problem just south of me, I hope the global warming they say we have does not bring it to me! I am so sorry you are having such an issue with it this year, I hope Great White recovers ok.

After having to deal with rust last year, I certainly can understand and sympathize with your rust issue in the south. I am glad that it broke out later and after peak season for you. Do you remove foliage of all that are affected? Will you be treating them with anything?

Actually my point was that rust is less of a problem this year than normal, it is very unusual for rust to be such a minor problem this late in the year. I would be thrilled if only a few plants had to be trimmed back each year. I feel sure Great White and any other that are trimmed back will have a good chance at full recovery.

Sorry, cross posted.
I am not currently spraying with anything. The things I used seems so ineffective, and I seemed to have better luck just cutting the leaves down low.
I probably should remove the foliage on all the affected plants, but I tend to try and gauge how fast the rust is progressing.
Sometimes a plant will show rust and never get very rusty. Others like 'Great White' this year, show some rust and then it just takes over the entire plant quikly. So those are the ones I cut back low.

Well, I have learned something today. I guess I have always assumed that the heat and humidity caused rust, and that it showed up mid summer. I have worried about rust a few times, but I gather rust wipes off, mine never did. Glad yours is just a mild case this year then.