Canker
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<plantfyi-glossary slug="canker"></plantfyi-glossary>Definition
A localized, sunken lesion or area of dead tissue on woody stems, branches, or trunks caused by fungal or bacterial pathogens. Cankers can girdle and kill branches; chestnut blight (Cryphonectria parasitica) wiped out billions of American chestnut trees in the 20th century.
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