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Q:

How can I control powdery mildew on my roses?

A:

One of the least-toxic and most effective controls for the powdery mildew fungus is the Cornell formula. The formula is 1 Tablespoon of baking soda and 1 Tablespoon of light vegetable oil or summer weight horticultural oil added to 1 gallon of water. Shake well.

Spray both the top and underside of all leaves once a week, or following a heavy rainstorm.

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