Powdery mold-like substance = powdery mildew. Common on many plants.
Fungicide spray every 10 days × 3 applications. Check local nursery for product labeled for powdery mildew.
OSU fact sheet: https://ohioline.osu.edu/hyg-fact/3000/3047.html
Powdery Mildew on Tulip Tree: Identification and Management
Powdery Mildew on Rosemary: Organic Controls
Jasmine Fungal Leaf Spot: Neem Oil + Water Management
Powdery Mildew on Holly: Fungicide Options and Application Timing
Powdery Mildew: Identification, Prevention, and Fungicide Management
Powdery Mildew on Euonymus: Identification and Management
Powdery Mildew Control: Identification, Resistant Varieties, and Treatments
Managing Powdery Mildew on Mature Lilac Hedge
Identifying and Treating Powdery Mildew on Holly Trees
Powdery Mildew on Lilacs and Peonies: Common, Manageable
Quaking Aspen Powdery Mildew: Identification and Large-Tree Management
Lilac White Coating: Powdery Mildew or Cottony Scale?
Yard-Wide Powdery Mildew: Cultural Fixes and Neem Treatment
Citrus Tree with White Fungus, Ants, and Spider Webs: Aphids, Scale, and Powdery Mildew
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