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Every spring the leaves on my dogwood tree become covered with a grayish-white powder. What is this, and how can it be prevented?
Last Updated: January 07, 2008
Powdery mildew (Microsphaera/Phyllactinia) is infecting the foliage and can also affect the flower buds. Untreated infections can cause leaf drop and reduce flowering. Powdery mildew can severely reduce plant vigor, especially on weakened trees. It's most prevalent during the warm days and cool nights of spring, when there is rain or overhead watering. Apply a fungicide according to label directions.
Contact your local Extension office for fungicide recommendations.
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