Donald-- I have dealt with rust twice on two new daylilies. Once I used a systemic and baking soda. Twice I noticed rust on Dusty Miller's. Here they never die, I end up with wood trunks on them. That year it seemed like it was going to spread throughout the daylilies. Now I will not keep a Dusty Miller or susceptible plants for more than 15 months. I wash all my daylilies with baking soda and dish soap in the spring. I am blessed that I do not have rust. I think it is the baking soda, but I have a lot of heat dormancy. Heat causes rust to go domant, but there has to be a point that kills it. I thought rust was not prevalent here because of the hot summers. The only part of the country that is continually hotter is Phoenix Az area. May everyone's garden experience blessings!