Cankers are areas of dead tissue infected by bacterial or fungal disease, caused by a variety of pathogens. They are most common on plants weakened by environmental stresses, such as drought. Cankers vary in size and shape and usually appear on bark as localized, sunken lesions.
Canker, plant disease, caused by numerous species of fungi and bacteria, that occurs primarily on woody species. Symptoms include round-to-irregular sunken, swollen, flattened, cracked, discoloured, or dead areas on the stems (canes), twigs, limbs, or trunk.
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