My perennial phlox has white moldy leaves all over. Should I cut them down to the bottom? I sprayed fungicide on them, but it didn't help.
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Cut off infected parts and spray the rest of the plant with horticultural oil.
From SFGate:
Sulfur or copper fungicide will help treat powdery mildew on plants such as garden phlox. However, before treating the plant with the fungicide, test it on an inconspicuous area of the garden phlox and wait 24 hours.
Most likely your plant will recover with just a little TLC. White powdery mildew is a fairly common problem and just takes a good cleaning and spraying with an effective fungus spray that is safe for your plant.
www.thespruce.com/
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