Managing Powdery Mildew and Distorted Growth on Trees

Managing Powdery Mildew and Distorted Growth on Trees

When tree leaves develop a white powdery coating, curl at the tips, turn yellow, and new branches grow flattened like celery stalks, powdery mildew is often the culprit. This common fungal disease thrives in warm, dry conditions with cool nights and can severely affect tree health if not managed.

Symptoms to Watch For

• White, powdery fungal growth on leaf surfaces
• Leaves shrinking, curling, and developing pointed, yellow tips
• New branch growth appearing flattened or distorted
• Reduced vigor and potential premature leaf drop

Treatment Options

Commercial Fungicide

Wettable sulfur powder mixed with water and sprayed on foliage is effective when temperatures are below 90°F (32°C). Apply according to label instructions, ensuring thorough coverage.

Homemade Remedy

Mix 1 tablespoon baking soda with 1 tablespoon cooking oil in 1 gallon of water. Spray every 4–5 days for 4–5 applications. Prepare a fresh batch each time. This mixture alters leaf surface pH, inhibiting fungal growth.

Cultural Practices

• Improve air circulation by pruning crowded branches.
• Water at the base of the tree to keep foliage dry.
• Remove and dispose of severely infected leaves.

Monitor the tree after treatment; improved health should become evident within a few weeks.