Karen. sorry u have the blighted rust. To add to Larry's comment, I have found the impact even on a particular plant varies greatly from time to time. Hope u can access this article which has an interesting, non simplistic report on their trial for daylily rust. http://www.aucklandbotanicgard...
helpful things I have learned from @sooby
and from my experience:
- the rust can affect all green parts but is not systemic in the whole plant (ie. the roots and crown)
- uninfected new or old leaves of a plant can be (and often are) infected by spores from a leaf on the same plant
- high temperatures do not kill the rust. They may slow down the infection rate but they sure stress the plant.
Our climate is ideal for rust. - humid and showers or heavy rain. Occasionally I think I shld just grow other things. We have just had some rain after an unusual period of 4 dry windy months. I try and remove at least the badly affected leaves or parts thereof especially before rain. I have never sprayed with anything as it is always too windy and I think I would not get it all.
Some I thought would always be a heartache have now diminished in their horridness. In particular HELENA SEABIRD and MILDRED MITCHELL seemed hopeless but have been good for months. Even BAT MASTERTON which GlenI gave me has looked OK for a long time now. So it is an ever changing situation for me.
But most impressive is one plant, which I hope to identify soon as it has big healthy leaves. It was horribly infested with rust so I kept removing as much leaf as I dared. As soon as it was large enough early this year I risked all and removed all green parts (RAGP) as Sue Bergeron explains with excellent pics. It never looked back.
Several that I bought in May from a rust free grower became infected within a few weeks. Like Larry I have several I bought which had a score of 1.00, but disappointingly they do get rust. viz. CRAYOLA VIOLET, RADIANT RUFFLES and PIRATE'S PATCH. But some I have show excellent resistance so far: MOONLIT ORCHID, MARCIA FAY, TROPICAL HEAT WAVE, TWIN CLASSIC, MOONLIGHT MIST, PERSIAN MARKET, GRACEFUL EYE, METAPHOR. Also some red and yellow NOIDS.
KIMBERLY SUE seems very resistant