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Southern blight is caused by the fungus Sclerotium rolfsii. The disease is a problem primarily in the Piedmont apple-growing region in the southeastern United States. S. rolfsii is a widespread pathogen that affects several hundred plant species. For more information, read this article on Southern Blight in Apple Trees.
Answer provided by Alan R. Biggs, West Virginia University.
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This resource area was created by the: Apples community
All about understanding and choosing the right rootstock
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Buying and planting trees
Managing Apple Trees and Orchards
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