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Sirococcus clavigignenti-juglandacearum
''Sirococcus clavigignenti-juglandacearum'' is a mitosporic fungus that causes a lethal canker disease of Butternut trees (''Juglans cinerea''). Known in the vernacular as butternut canker, it is also known to parasitize other members of the ''Juglans'' genus on occasion, and very rarely other related trees including hickories. The fungus is found throughout North America, occurring on up to 91% of butternut trees, and may be threatening the viability of butternut as a species.
==Distribution==
Butternut, the primary host of ''S. clavigignenti-juglandacearum'', is found in mixed hardwood forests throughout central North America, from New Brunswick to North Carolina.
Butternut canker was identified as an invasive species in 1967. It was first discovered in Wisconsin, but has since spread to other states and into Canada. Its native origin is unknown, but possibly in Asia given the resistance of Asian walnuts to the disease.〔 The United States Forest Service found that 84% of all butternuts in Michigan as well as 58% of all trees from Wisconsin have been affected; later surveys by the Wisconsin Department of Natural Resources revealed that 91% of all living trees in Wisconsin were diseased or cankered. In Virginia and North Carolina, the butternut population has been reduced from 7.5 million to 2.5 million.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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