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Overview. Cryphonectria parasitica is a parasitic fungus of chestnut trees. This disease came to be known as chestnut blight. Naturally found in South East Asia, accidental introductions led to invasive populations of C. parasitica in North America and Europe. In the first half of the 20th century, the fungal disease had a devastating economic ...
While Asian chestnut species evolved with the blight and developed a strong resistance, the American chestnut and Allegheny chinquapin have little resistance. [59] [60]: 145 [61] The airborne bark fungus spread 50 mi (80 km) a year and in a few decades girdled and killed more than three billion American chestnut trees.
The mission of The American Chestnut Foundation (TACF) is to restore the American chestnut tree to the forests of Eastern North America by breeding genetically diverse blight-resistant trees, evaluating various approaches to the management of chestnut pests and pathogens, and reintroducing the trees into the forest in an ecologically acceptable manner.
The chestnut blight was introduced in the late 19th century with the Japanese chestnut and decimated the once-widespread American chestnut tree. [9] Native un-modified trees are killed from the ground up by the blight, and only the root system survives. The roots then continue to send up shoots that are once again attacked by the blight and die ...
Struck by a blight identified in 1904, American chestnut trees are considered "functionally extinct." Now those that remain are facing a new disease.
Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by elm bark beetles. Believed to be originally native to Asia, the disease was accidentally introduced into America, Europe, and New Zealand. In these regions it has devastated native populations of elms that did not have resistance to ...
New forests of blight-resistant hybrid chestnut trees, including some planted by Briceville students, are thriving on the reclaimed mountain coal mines of Anderson County. D. Ray Smith, writer for ...
The American chestnut tree used to grow throughout the eastern U.S., but was devastated by a blight in the early 20th century.