A common disease of apple trees caused by the ascomycete fungus Venturia inaequalis, characterized by the occurrence of dark blotches on the leaves and dark scab-like spots on the fruit.
Origin
Late 19th century; earliest use found in American Naturalist.
Definition of apple scab in US English:
apple scab
noun
A common disease of apple trees caused by the ascomycete fungus Venturia inaequalis, characterized by the occurrence of dark blotches on the leaves and dark scab-like spots on the fruit.
Origin
Late 19th century; earliest use found in American Naturalist.