Pat I spray twice monthly from spring through fall, once monthly Oct. through March. I add a water soluble fertilizer to the spray each time I spray for rust. (16-4-8) or something similar, if I have to spray I may as well feed them.
Sue I have dealt with rust since 2001, I have tried all the rotation ideas and anything else that has been recommended by the higher ups, I have spent a lot of money trying different things, I now do what works for me and had rather not get into a drawn out discussion over this subject. Please don't take this the wrong way, I just don't care to get into it.