pest photo

Robert L. Anderson, USDA Forest Service,
Butternut canker
Ophiognomonia clavigignenti-juglandacearum

Butternut canker (Ophiognomonia clavigignenti-juglandacearum) is a fungal pathogen. It is a native of Asia and was first detected in Wisconsin in 1967.

Sirococcus clavigignenti-juglandacearum is a mitosporic fungus that causes a lethal canker disease of Butternut trees but can aparasitize other members of the Juglans genus.
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