Chestnut Blight

Canker Diseases - Hardwoods

Chestnut Blight

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Young cankers caused by Cryphonectria parasitica on American chestnut.

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Large canker on main stem of chestnut caused by Cryphonectria.

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Perithecia of Cryphonectria parasitica.

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Pycnidia with spore tendril (cirrus). Asexual spores are produced by the pycidium during wet weather.