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There are three types of mold: powdery mildew, sooty mold and gray mold. Trim trees around the lilac so the lilacs get more sun. Prune the lilacs of the mold and keep the debris in separate bags. After each cut, dip the tool into bleach water with 9 parts water and 1 parts bleach. Do not compost this! Otherwise you may need neem oil or other fungicide in late summer or early winter. If it is sooty mold, you will have to do ant control and use ladybugs or lacewings to eat the scale.

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9y ago
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Q: What should I do with mold on my lilac bush?
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