hey just wondering if anyone has used this serenade fungicide. how often can i use it? every few days? and is it ok to spray the buds with it too, its all organic the guy at the grow shop told me. im about a month away from harvest and have powdery mildew that is spreading rapidly and need to control the mildew so it doesnt get to the buds. should i just spray the whole plant even the buds with the serenade?