The Q&A Archives: Black Spot problem

Question: I know that there are many commercial products that one can buy to combat the problem of Rose bush

Answer: I've heard that mixing one tbsp. baking soda to 1 gallon of water and spraying every 7-10 days will work. I haven't tried it, but many people swear by it. Apply in the morning, not during the heat of the day.

Hope this helps!

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