High Quality Content by WIKIPEDIA articles! The chestnut blight fungus, Cryphonectria parasitica, is the cause of massive extinction of the once-widespread American chestnut tree. The chestnut blight was accidentally introduced to North America around 1900, either through imported chestnut lumber or through imported chestnut trees. In 1905, American mycologist William Murrill studied the disease, isolated and described the fungus responsible, and demonstrated by inoculation into healthy plants that the fungus caused the disease. By 1940, mature American chestnut trees were virtually wiped out by the disease.

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