Apple Scab Is A Common Fungus That Affects Apple And Crabapple Trees

Apple scab is caused by the fungus Venturia inaequalis and is a common disease in the cool, wet weather in early spring. High humidity in the early summer can also promote the spread of the disease.

Signs And Symptoms Of Apple Scab

The signs and symptoms to look out for in your ornamental crab apple

• Black spots on leaves and fruit
• Yellowing leaves
• Premature leaf drop
• Sparse canopy

Managing And Preventing Apple Scab

Planting disease-resistant varieties of apple and crabapples is the best way to avoid this disease. If your crabapple is showing signs and symptoms of apple scab, our Plant Health Care Specialists can prescribe fungicide treatments to manage the disease. Other management options include cleaning up fallen leaves, sanitizing garden tools after use, and pruning your trees for good air flow.

If needed, your ISA Certified Arborist can help develop the right plan for you.