Question: I am fairly certain my zucchini have powdery mildew. Is there a treatment for this?
Answer: Mildew would be controlled with a fungicide; you might wish to contact your county extension (837-1402) to verify that it is indeed mildew and for the most up to date recommendations on what to use to control it.
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When singular and plural spellings differ, as in peony and peonies, try both.