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Baking Soda
Add 1 Tbsp. baking soda to a gallon of water. When the baking soda has dissolved, add ¼ to ½ tsp. of insecticidal or other liquid soap. Shake well.
Diseases Controlled
Powdery mildew; black spot
How Often to Apply
Weekly
Precautions
Detergent can cause plant damage; concentrations greater than 1 Tbsp./gallon may be toxic to roses; baking soda can accumulate in soil.