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Powdery Mildew on Crimson King Maple: Identification and Fungicide Options

Crimson King maple leaves turned milky white. Cause and treatment?

Diagnosis: Powdery Mildew

White, fluffy fungal growth on leaves/stems. Favored by:

Cool, humid weather
Shade
Spring/fall/winter

Symptoms: dwarfed, curled, deformed leaves; possible defoliation.

Fungicide Options (Apply to Foliage)

Propiconazole (Banner Maxx)
Myclobutanil (Systhane, Eagle, Immunox)
Sulfur (spray/dust) — avoid >90°F
Triforine (Funginex)
Triadimefon (Bayleton, Strike)
Fenarimol (Rubigan)
Copper (some situations)

Cultural Management

Rake/destroy fallen leaves (spore source)
Improve air circulation
Preventive spray next spring at leaf emergence

Powdery mildew rarely kills maples but ruins appearance.

Plant Diseases: Powdery Mildew on Tulip Tree: Identification and Management; Crimson Sentry Maple Powdery Mildew: Multiple Control Options; White Spots on 'King Crimson' Maple: Common Leaf Fungus, Easy Management; Severe Powdery Mildew on Crimson Sentry Maple: Fungicide Rotation; Pruning a Young Crimson King Maple: Fixing a Forked Leader; Replacing a Cement Patio Near a King Crimson Maple: Best Materials and Methods; Crimson King Maple Bark Loss: Sunscald Prevention; King Crimson Maple Broken Branches: Proper Pruning Cuts; Treating Powdery Mildew on Crimson King Maple; Don't Top Young Crimson King Maple

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