[Cynthia, Prescott, AZ]

My recommendation is to use a systemic fungicide. Don't bother with Physan 20, unless that is all you have available until you can get one of the systemics. My best recommendation is Thiophanate methyl (Cleary's 3336, OHP6672, Bonomyl, Fertilome Halt, Daconil, Spectro90, Topsin M,.. , but check labels to be sure these names are correct), with a runner up of Phyton 27. Some other systemics are triadimefon (Baylton) and Propiconozole, which I have found more locally available. Problem is that some of these are better on some fungi than than others. Are you sure that your problem doesn't just require better culture? Spotting is usually caused by things like letting plants get too cold.