Ninebark Shrubs

Powdery Mildew on Ninebark Shrubs

Anonymous added on October 14, 2011 | Answered

I was told there was good results for mildew using a baking powder solution. If you know the formula, I would appreciate it. It also had small amount of dish soap.

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Certified GKH Gardening Expert
Answered on October 15, 2011

Recipe: 3 tablespoons baking soda plus 1 tablespoon of Murphy's oil soap, dish soap, or a lightweight horticultural oil in 1 gallon of warm water. Mix well and let cool. Shake well just prior to spraying. Apply this spray (making sure to get the undersides of leaves) every 7 to 10 days until the powdery mildew is gone.

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