Vinegar For Black Spot - Knowledgebase Question

Independence, KS
Question by Familyterra
February 28, 1998
I have a terrible problem with black spot on my roses. I have heard that diluting vinegar with water is an inexpensive cure. Do you know how much the vinegar should be diluted?


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Answer from NGA
February 28, 1998

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I've not heard of using vinegar on roses, but I have heard of using baking soda mixed with water. The recipe is 2Tbps. baking soda to one gallon of water. The baking soda mixture changes the pH of the water on the surface of the leaf and keeps the black spot from attacking. Try to keep your plants well pruned to increase good air circulation, pick off the affected leaves as soon as you notice the black spots, make sure your rose bushes get full sunshine, try not to splash water on the leaves, and youmay be able to avoid black spot in the first place.

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