Treating Powdery Mildew on Apple Seedlings

Identifying the Problem

White, webby patches on apple seedling leaves that cause bubbling and distortion are classic symptoms of powdery mildew—a common fungal disease. It thrives in humid conditions with poor air circulation.

Effective Treatment

• Apply a fungicide labeled for fruit trees every 10 days until symptoms disappear.
• Improve air circulation around the plant.
• Avoid overhead watering; water at soil level.
• Remove and destroy severely infected leaves.

Prevention for Future Growth

• Choose mildew-resistant apple varieties when possible.
• Space plants adequately for good airflow.
• Prune to open canopy as the tree matures.
• Monitor regularly, especially in spring and fall.

With prompt treatment, your seedling should recover and continue growing vigorously.