Obviously Bill is the person to answer this question, but I suggest that you spray weekly and after every rain. The bleach is not a preventative but rather it attacks the fungus that is growing on the plants. You should do a follow up spray with a fungicide within 24 hours of doing the bleach spray. Spraying should only be done in the early morning or early evening to avoid burning you foliage in the direct sun. It is suggested that you rotate by using a different fungicide every other week.
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~ Patti ~
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