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Apple Scab (Venturia inaequalis)

Apple Scab (Venturia inaequalis)

The photomicrograph above illustrates a stained thin section of apple tree stem infected with apple scab, a destructive disease of apple trees caused by the fungus Venturia inaequalis. Apple scab is one of the most serious diseases of apple trees and occurs wherever apples are grown. It can also infect crab apple and mountain-ash trees.

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