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Home > Diseases > Trees and Shrubs > Apple Scab

Apple Scab—Venturia inaequalis

Apple scab is caused by a fungus which overwinters in infected dead leaves and fruit. The scab-like lesions on leaves and fruit can cause defoliation and will reduce fruit quantity and quality.

leaf showing apple scab apple showing apple scab apple with apple scab
Olive-colored irregular lesions on sepals and leaves appear in late spring and later become gray to black and velvety in appearance. Roughly circular spots disfigure fruit. An example of fruit disfigured by apple scab.

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[Photos, left to right: University of Georgia Plant Pathology Archive, University of Georgia,; Clemson University - USDA Cooperative Extension Slide Series,; Joseph O'Brien, USDA Forest Service,]

It is the policy of the State of Maine to minimize reliance on pesticides. The Maine Department of Agriculture, Conservation and Forestry and the Maine IPM Council encourage everyone to practice integrated pest management and to use pesticides only as a last resort. The mention of pesticides in the fact sheets linked to these pages does not imply an endorsement of any product. Be sure that any product used is currently registered and follow all label directions.