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Powdery Mildew in Spiraea

How to identify and treat powdery mildew in Spiraea.

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Spiraea care requirements

water
Moderate watering; keep soil consistently moist during growing season; somewhat drought-tolerant once established
soil
Well-draining soil; tolerates poor, sandy, and clay soils; prefers slightly acidic to neutral pH
light
Full sun to partial shade; flowers most abundantly in full sun; tolerates light shade
symptoms

Symptoms to look for in Spiraea

  • fiber_manual_recordWhite powdery patches on leaves
  • fiber_manual_recordDistorted new growth
  • fiber_manual_recordPremature leaf drop
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Common causes in Spiraea

Caused by various fungal species. Spreads in warm, dry conditions with high humidity nights.

healing

How to treat powdery mildew in Spiraea

Remove affected leaves. Apply neem oil, potassium bicarbonate, or sulphur-based fungicide. Improve air circulation.

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Preventing powdery mildew in Spiraea

Space plants for good airflow. Avoid overhead watering. Choose resistant varieties.

Powdery Mildew in Spiraea — Symptoms & Treatment | GreenScout