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Why are my viburnum leaves covered in white spots?

Our Advice:

White spots on viburnum leaves can be a sign of powdery mildew, which is a fungal disease. This disease is most common in warm, humid weather and can be prevented by ensuring good air circulation around the plant. Other possible causes of white spots on viburnum leaves include scale insects or mealybugs, which can be treated with insecticidal soap or neem oil.

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