Definition of rough–bark
1 : any of several virus diseases of woody plants (as cherry, apple, citrus) characterized by generalized roughening and often longitudinal splitting of the bark
2 : a disease of apples that is caused by a fungus (Phomopsis mali) and produces rough cankers on the twigs and branches
3 : a nonparasitic disease of fruit trees (as apples and pears) characterized by a general roughening of the bark and not by local cankers
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