Well, sulfur burners are the way to go, but if you're diligent with spraying, you can control it.
Neem Oil is a natural fungicide that will kill it within 24 hours. Or a soap solution with Baking Soda in it may work. Or a garlic solution. Serenade is a baccillus that is supposed to eat it, but it didn't work for me. (want a used bottle?)
Check the FAQ.
HTH
