I am bumping this up since I have questions about rust!
This is what I posted on a different thread:
Also ... Because I try to grow organically, I attempt to stay away from fungicides/pesticides/etc. Unfortunately, I get aphids, thrips, and rust. Fall is the worst time for all those daylily woes. I have several daylilies that seem to be rust buckets. They are like a magnet to rust fungus. They are all NOIDs, so I have no idea of the cultivars.
Well, today, I noticed one that looked pretty bad due to rust and aphids. I removed most of the leaves/blades from it. Right next to it is a much larger daylily and not a speck of rust on it. I am wondering if older, more established daylilies are more rust resistant or are some cultivars just less prone to rust attacks? I say that because most of my larger plants don't seem to be bothered much by rust. Maybe they are larger because they aren't stunted by rust fungus? I think most of mine are indeed prone to rust, but those few that rarely show any signs of rust and just keep growing green and beautiful always amaze me, especially when the rest of my daylilies are looking pretty ugly. And then all the pests and diseases/funguses subside and my daylilies look nice and healthy again with their new growth. The high humidity here in FL ... it is always short-lived to have perfect looking plants without treatment. I wondered, too, if a daylily was exposed enough times to rust, could it become immune to the fungus if it is an otherwise healthy plant? I don't believe I've ever lost a daylily to rust, but I do know when they are weak, they get attacked by everything!
Any info I would greatly appreciate!
