Answer: Yes, Baking Soda IS good for black spot! To make the solution, mix 1 tablespoon of baking soda and 2 1/2 tablespoons of ultra-fine horticultural oil spray with a gallon of water. The oil is slightly fungicidal and acts as a spreader-sticker, helping thebaking soda coat the leaf and cling to the surface longer. The solution is a contact protectant so it stops fungi from attacking plant tissue, but doesn't cure the problem... Apply it as soon as the symptoms appear, repeating about every 2 weeks. Be sure to get under the leaves too!<br><br>To help prevent the spread of disease, water early in the day and try not to work around the plants if they are wet. You might spread it with your tools. Be sure to remove any infected leaves. Put them in thetrash...NOT the compost bin!
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