A baking soda recipe given by Dr. Thomas A. Zitter, a professor in the Cornell University Department of Plant Pathology. He has added the horticultural oil to his recipe but adds that this recipe with the oil should be used only occasionally for some plants may be injured by repeated applications of oil. I have used it in the spring before the heat set in. The horticultural oil will further block any overwintering blackspot on the roses and will help the solution stay on the leaves.
Here’s the recipe:1 tablespoon baking soda or potassium bicarbonate
1 tablespoon horticultural oil
1 gallon water1 gallon backpack or pump sprayer
Mix all ingredients in the sprayer and spray the underside and top of all leaves.
Tuesday, July 28, 2009
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