Tree Diseases & Fungus: Apple Scab

Scab is a common disease on apples, crabapples, and pears. Apple scab fungus infects the leaves and fruit of the tree and can spread during the spring rains. The first signs of apple scab is spots on the leaf or fruit that look like dirty mold spots, though as the disease progresses and the spots or lesion grow forming a scab on the plant.

After infection, the tree may begin to lose leaves and fruit early. To help stop the spread of disease, rake and destroy plant debris that had come off the infected tree. A fungicide may also be applied to susceptible trees in early spring before it blooms, followed by 2 more sprays about 15-20 days apart.

Pear scab affects pears in the same, though may spread to the twigs of the plant.

Unfortunately, the fungicides will not 'cure' this tree disease, they will only prevent it for that season. To prevent early defoliation, the crabapple trees will need to be sprayed annually for the rest of that trees life. Some residents may opt to replace the plant.

Disease Development Favored by:

Corrective Measures:

If you believe your trees or shrubs have been affected with disease or fungus activity, call Grounds Services today for a no-obligations visit at 419-536-4344.


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