[Cynthia, Prescott, AZ]

My experience is quite different from Jerry's. The only fast moving infection I've had experience with is bacterial, not fungal. Fungal infections generally happen because the plant is under stress (too cold, too cold and wet, too little light for too long, or something equivalent). I agree that fungal problems should be treated with systemic fungicides, and Thiophanate Methyl (Clearry's 3336, and many others) is available in hobbyist sizes and is as good as they come. Look up Bonomyl or Fertilome Halt, but check the label to make sure it is Thiophanate Methyl. If you have a fast moving wet looking infection, Phyton 27 is a systemic bactericide and fungicide, but is not as good for fusarium wilts, my own personal major problem. If you search well, you can find Phyton 27 in a 2 oz. size.