I know I saw rust on one of mine but I sprayed with the Dawn and now it is gone. Really! I got rid of all my rust susceptible daylilies and purchased rust resistant ones, I did not want any problems since I live in a hot humid area. They all got rust anyway. That is why I pay it no mind anymore, if I did I would not be able to enjoy them. the same goes for spraying chemicals. I will just cut them off and let them grow back.