How to Get Rid of White Spots on Crepe Myrtle

White spots on crepe myrtle are typically caused by powdery mildew, a common fungal disease. Treatment involves proper pruning, fungicides, and cultural practices to prevent recurrence.

Common Causes of White Spots

  • Powdery mildew fungus thriving in humid conditions
  • Inadequate air circulation around branches
  • Overwatering or poor drainage
  • High nitrogen fertilization

Treatment Methods

  1. Pruning: Remove infected branches and improve air flow
  2. Fungicides: Apply sulfur or neem oil sprays
  3. Watering: Water at soil level, avoid overhead watering
  4. Sanitation: Clean up fallen leaves and debris

Comparison of Treatment Approaches

Method Cost Duration Effectiveness
Pruning + Fungicide $20-50 2-3 weeks High
Organic Sprays $10-25 3-4 weeks Moderate
Cultural Changes $5-15 4-6 weeks Low-Moderate

Prevention Strategies

  • Plant in full sun with good airflow
  • Avoid overhead irrigation
  • Apply balanced fertilizer appropriately
  • Monitor plants regularly for early signs