Things You'll Need:
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Step 1
Make a solution of 1 teaspoon baking soda and 1/4 teaspoon oil, mixed in 1 quart of warm water. Use horticultural oil or even cooking oil.
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Step 2
Spray the tree every 10 - 12 days with the solution until there is no longer any sign of the powdery mildew.
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Step 3
Place the tree outside in a protected, shady location and give it a shower. Do not leave it out overnight unless all danger of frost is past.








