Canker (Mechanical) of Apple
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Canker (non-pathogenic) caused by mechanical damage can result in plant decline, stunting, and other stress-related symptoms that are visible aboveground. Mechanical damage at soil level or on trunks may be caused by mowers, equipment, sun scald, or freeze damage. Young trees are most often affected by mechanical damage.
Non-pathogenic canker.
(Photo: Mark Longstroth, Michigan State University)
