fungal disease that has killed half of Vermont’s butternuts
JERICHO, Vt. — In the 29 years since a fungal disease known as butternut canker was first observed in southwest Wisconsin, it has infected over 90 percent of butternut trees throughout their native range from New Brunswick, Canada, to Georgia to Minnesota.
Dr. Bergdahl was the first to find the canker in Vermont, near Snake Mountain, in the fall of 1983. Since then, it has killed half the butternuts in the state. The fungus, Sirococcus clavigignenti-juglandacearum, was described as a new species in 1979 and bears the earmarks of being recently introduced. But it has never been found outside North America.
Dutch elm disease and chestnut blight, also caused by fungi, were notorious, and much more conspicuous, because elms and chestnuts were abundant. Butternuts are little-known, however, and have always been sparsely distributed. But there is a growing effort to understand the disease.
http://www.nytimes.com/2006/11/28/science/earth/28butter.html
JERICHO, Vt. — In the 29 years since a fungal disease known as butternut canker was first observed in southwest Wisconsin, it has infected over 90 percent of butternut trees throughout their native range from New Brunswick, Canada, to Georgia to Minnesota.
Dr. Bergdahl was the first to find the canker in Vermont, near Snake Mountain, in the fall of 1983. Since then, it has killed half the butternuts in the state. The fungus, Sirococcus clavigignenti-juglandacearum, was described as a new species in 1979 and bears the earmarks of being recently introduced. But it has never been found outside North America.
Dutch elm disease and chestnut blight, also caused by fungi, were notorious, and much more conspicuous, because elms and chestnuts were abundant. Butternuts are little-known, however, and have always been sparsely distributed. But there is a growing effort to understand the disease.
http://www.nytimes.com/2006/11/28/science/earth/28butter.html