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Canker (fungus)

Canker (fungus)
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Cankers can be caused either by living organisms, including fungi and bacteria, or by nonliving things such as excessive low or high temperature or hail. Several fungi can cause cankers they enter the surface of the tree, gain access through natural or man/-made wounds, and usually only cause disease when the tree is under stress. However, some fungi aggressively attack trees and cause cankers.