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Why are my viburnum leaves covered in a powdery substance?

Our Advice:

A powdery substance on viburnum leaves is a common sign of powdery mildew. This fungal disease can be caused by various fungi and thrives in warm, humid conditions. To prevent powdery mildew, ensure good air circulation around the plant, avoid overhead watering, and remove infected leaves. Fungicides may also be necessary in severe cases.

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