The Q&A Archives: Diseased Concord Grape

Question: My Concord grapes leaves and stems are lavender pink color with raised texture. What can be causing this and how can I control it?

Answer: It sounds as though some little mites were feeding on the leaves early in the season. As the mites feed they leave behind an irritating substance which causes discoloring and raised areas on the leaves of some plants. Since the mites have already disappeared and there's nothing left but the raised welts, there's no need to spray the leaves. Remove the leaves from the garden after they fall to the ground (just in case some eggs were left behind).

Next year your plants should be fine.

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