Homemade Black Spot Prevention: Baking Soda Spray Recipe

Homemade Black Spot Prevention: Baking Soda Spray Recipe

Yes, mix baking soda and dish detergent together in the same bucket. This is a preventive spray – it won't cure existing black spot (those leaves won't turn green again).

Recipe & Application

• 3 tsp baking soda + 1 tbsp dish detergent per gallon of water.
• Hose down leaves first, let dry.
• Spray in evening, thoroughly coating undersides of leaves.
• Repeat daily during active disease pressure; weekly as prevention.

Additional Tips

• Invest in a quality sprayer – it makes the job easier and more effective.
• Sprinkle cornmeal around base as a natural fungal suppressor.
• Use proper rose fertilizer (not homemade) for consistent nutrition.
• Messenger (harpin protein) can boost overall plant immunity.

Prevention starting early next season is far more effective than treating established infections.