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Basil Downy Mildew

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by Colette Mancke, Tennessee Master Gardener. What is basil downy mildew? Basil downy mildew is a devastating disease that affects the leaves, branches and stems of many types of basil (ie.,plants in the genus Ocimum) commonly used for cooking. Green-leafed varieties of sweet basil are particularly susceptible to the disease, while purple-leafed varieties of basil, Thai basil, lemon basil and… Read more »