Asian chestnut blight fungus

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Castanea dentata. Ina forester working at the Bronx Zoo in New York noticed a strange new disease infecting chestnut tree bark on the outside ridges of the zoo. This moment in time is regarded as the first known case of Cryphonectria parasiticacommonly referred to as chestnut blight, and infamously known otherwise as perhaps the most destructive forest disease on record.

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Diseases, other than chestnut blight, have not played a major role in terms of chestnut tree growth and survival in Michigan. Chestnut blight is a very serious pathogen that needs to be taken seriously because it can infect and kill European X Japanese hybrids. Cultivars with Chinese chestnut backgrounds are generally tolerant or resistant.

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In sweet chestnut blight, caused by the fungus Cryphonectria parasitica, was found for the first time in the United Kingdom UK on trees imported from France in and planted at two sites, one in Warwickshire in the West Midlands and the other in East Sussex in southern England. The attractive dark green and glossy foliage of sweet chestnut would be sorely missed. Sweet chestnut has been undergoing a strong renaissance for timber and biomass energy as well as being an important habitat for increasingly uncommon spring flowers, butterflies and birds that respond to the positive light regimes within properly managed sweet chestnut coppice.

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Contributed by Sandra L. Anagnostakis po. Anagnostakis, S. APS net Features.

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Chestnut blightplant disease caused by the fungus Cryphonectria parasitica formerly known as Endothia parasitica. Accidentally imported from Asia, the disease was first observed in in the New York Zoological Gardens. By it had decimated the American chestnut Castanea dentata population in an area extending over 1, km 1, miles north, south, and west of its entry point.

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Chestnut blight Cryphonectria parasitica has probably had the most pervasive influence on forest structure and composition in the southern Appalachians of any disease or insect. Prior to the introduction of this disease, the American chestnut Castanea dentata was the tallest and most dominant hardwood species in the eastern United States Fig. It grew in vast stands from Maine to Florida, with the largest trees occurring in the southern Appalachians Schlarbaum et al.

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It rivalled oak trees in terms of size and abundance. The trees were also highly valued for their rot-resistant wood and edible seeds, making it one of the most economically important trees in eastern North America. So, if the trees were so common and so important, where are they today?

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Since the early 's a disease known as Chestnut Blight has infected many American Chestnut trees and causing their removal from forests. A greater look at the history of this fungus as well as the mechanisms of action will allow us to learn on how to preserve the American chestnut. At one point, the American chestnut was virtually eliminated.

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The pathogenic fungus Cryphonectria parasitica formerly Endothia parasitica is a member of the Ascomycota sac fungi taxon. The fungus spread rapidly and caused significant tree loss in both regions. Cryphonectria parasitica is a parasitic fungus of chestnut trees. This disease came to be known as chestnut blight.

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