Powdery Mildew: Prevention, Identification & Treatment
Powdery mildew (PM) is a highly contagious fungal disease that affects cannabis plants, covering leaves, stems, and buds with a white, powdery coating . It thrives in humid, stagnant air environments and can rapidly weaken plants, reducing yield quality and potency . This section covers early detection, prevention, and effective treatment strategies to keep your grow mildew-free.
Signs & Symptoms of Powdery Mildew:
Early Stage: Small white spots on leaves and stems
Progression: Powdery white coating spreads across plant surfaces
Advanced Stage: Leaves yellow, curl, and die; buds become infected and unsmokable
Spread: Spores travel through air, water, and direct plant contact
Prevention & Control Measures:
Humidity Control: Maintain RH below 50% to discourage fungal growth
Proper Airflow: Increase ventilation and use oscillating fans to reduce stagnant air
Leaf Pruning & Spacing: Remove excess foliage to improve light penetration and airflow
Fungicidal Treatments: Use organic solutions like neem oil, sulfur, potassium bicarbonate, or beneficial microbes
Early Removal: Immediately cut and dispose of infected leaves to stop spread
Discussion Topics:
• Best organic & chemical treatments for powdery mildew
• Preventing powdery mildew in indoor vs. outdoor grows
• Recognizing powdery mildew vs. other fungal infections
• Grower experiences and success stories in powdery mildew management
Keep your cannabis plants healthy and mildew-free – Learn, share, and master effective prevention strategies! 