Bruises produced before apples are mature are usually firm and dry as compared with the other types described. Preharvest bruises may be caused by orchard machinery, by the pressure of fruits against limbs, by hail, or by hitting fruits with ladders. As the fruits continue growth, the injured area becomes flattened or sunken and the tissues below become dry and spongy (see photo). Slight injuries produce no scarring of the skin. Some bruises, however, develop corky scar tissue over the surface of the skin at the point of injury.
Bruising injury on the tree