Chestnut blight
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| Chestnut blight fungus | ||||||||||||||||
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| Cryphonectria parasitica |
The chestnut blight is a fungal disease, Cryphonectria parasitica (formerly Endothia parasitica). It was accidentally introduced to the United States around 1900-1908, either in imported chestnut lumber or in imported chestnut trees, and by 1940, mature American chestnut trees had been made virtually extinct by the disease.
The blight appears to have been introduced from either China or Japan. Japanese and some Chinese chestnut trees are resistant to the fungus: they may be infected, but the blight does not usually kill them.
Despite the devestation the blight caused to the American Chestnut tree, the root collar and root system of the tree are fairly resistant to the blight, so a large number of small American Chestnut trees still exist as shoots from existing root bases. However, the shoots are seldom able to grow enough to reproduce before the blight attacks them.
External link
- American Chestnut Cooperators' Foundation - Blight Fungus (http://www.ppws.vt.edu/griffin/blight.html)