Scab: nf Scab (word coming from scab: marked with small spots) is a fungal disease of the leaves and fruits of apple and pear trees.
This disease is, along with moniliosis and powdery mildew, one of the main fungal diseases of apple trees (genus Malus). It is caused by an ascomycete fungus named Venturia inaequalis (of which there are several thousand strains) causing black or brown lesions on the surface of leaves, buds or fruits and sometimes ...
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