Scab Disease Control
Scab, including Apple Scab and flowering Crabapple Scab, are serious tree diseases. Scab is a fungus that also affects Mountain-Ash, Cotoneaster and Firethorn (Pyracanthas).
First appearing in the spring as gray to olive-green spots on the undersides of new leaves. As the infection progresses, lesions form on upper and lower leaf surfaces. Severe early leaf infection can result in dwarfed, twisted leaves, which might drop later in the season. Scab can also weaken a tree making it susceptible to other harmful diseases or insects.
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Here are actions you can take now. Scab overwinters on fallen leaves. Raking and removing leaf debris in the fall may reduce Scab. For susceptible cultivars, several fungicide sprays may be required for control. The most critical application period is early bloom, April to May. That’s when spores are released from debris. The best way to control Scab is to plant resistant cultivars.
If you have a tree that is at high risk for Scab and see leaf spots on the tree, contact Giroud. Your Giroud Arborist is an ISA Certified Arborist. He’ll evaluate the condition of your tree and determine if further action is required.
For more information on the top problems affecting trees in the Philadelphia area, check out our insect and disease control libraries.