I find there is a definite difference between summer and the cooler months with rust. It likes the warmer times. Even in wet winters, water does not seem to make a difference. Temperature.
My experience is that rust buckets are rust buckets in the shade or the sun. Same with air circulation, a rust bucket in splendid isolation with max air circulation is still an excellent rust bucket.
Unfortunately, some of my favourite daylilies are rust buckets. I trim and burn the leaves now. But I also spray which has made an excellent difference. But I will give it another season to see how I feel about all the spraying.
I suspect the RBs' days might be numbered. There are thousands of daylily cultivars out there that won't need the chemicals. To embrace them seems sensible.
