Today, more than years after a blight forced it into extinction, scientists are resurrecting this once-great tree. That annual exuberance of the American chestnut began fading from the landscape aroundwhen a blight imported on Asian chestnuts began rampaging from Maine to Georgia. By the s destruction was complete.
Spores of the fungus are spread through wind, rain, and on small animals. Spores that find a wound in the bark of a chestnut tree grow quickly through the cambium layer, girdling the tree.
The fungus causes sunken or swollen cankers to form on the bark. The tree dies back above the cankers, typically in the first season. The whole tree often dies in the second year of infection.
Biology Origin Chestnut blight is native to Asia and was brought to the United States on imported live trees.
Today the tree has been virtually eliminated as a commercial species in the eastern forests. The species can still be found in the understory since the roots of trees killed by the fungus may send up sprouts, but they are nearly all killed by the fungus while still saplings.
The fungus reproduces by creating yellow-orange fruiting bodies pycnidia that are the size of a pin head and contain asexual spores.
It produced a nut that was a nutritious food source for wildlife; the tree was ranked the most important wildlife plant in the eastern United States. The nut was also valued as food by humans. The tree was a prized lumber species since it grew straight, often 50 feet high before branching out, and the wood was rot-resistant.
More information about the historical and ecological significance of the American chestnut. Management Options Conserve living chestnuts. Learn to recognize the bark of mature chestnut, and take notice if chestnut burrs are encountered on the forest floor.
Healthy trees outside of the historic range may simply have escaped exposure to the fungus, and may not be resistant, but their conservation is important in retaining a diversity of chestnut genes. Support efforts to restore American chestnut.
The American Chestnut Foundation conducts an extensive backcross breeding program. Chinese and American chestnut hybrids are repeatedly bred to obtain trees with characteristics of American chestnut, but the blight resistance of Chinese chestnut.
Contact one of these organizations if you find a mature chestnut with no obvious cankers.The chestnut blight is a fungal infection affecting the American chestnut tree that had a devastating economic and social impact on communities in the eastern United States.
It later spread to other parts of the world including Italy.
. Chestnut Blight and American Chestnut Trees Essay - Chestnut Blight and American Chestnut Trees Since the early 's a disease known as Chestnut Blight has infected many American Chestnut trees and causing their removal from forests.
The return of the American chestnut to its former niche in the Appalachian hardwood forest ecosystem is a major restoration project that requires a multi-faceted effort involving members and volunteers, research, sustained funding, and most importantly, a sense of the past and hope for the future.
Infections of the American Chestnut Tree Essay Words 7 Pages Cryphonectria parasitica, a filamentous, ascomycete fungus, is the causal agent of the chestnut blight5,14 which was introduced to North America from Japan circa ,The chestnut blight infects all members of the Castanea family14, and some members of the genus Quercus.
The American chestnut (Castanea dentata) is a large, monoecious deciduous tree of the beech family native to eastern North America. Before the species was devastated by the chestnut blight, a fungal disease, it was one of the most important forest trees throughout its range, and was considered the finest chestnut tree in the world.
It is estimated that between 3 and 4 billion American chestnut. Bowes and Church's Food Values of Portions Commonly Used, Text and CD-ROM Package, Jean A. Pennington, Judith S. Spungen As You Like It (the New Hudson Shakespeare), William Shakespeare Sndwich Gigante, Lynn George .