butternut canker
(Ophiognomonia clavigignenti-juglandacearum)
This species is Introduced in the United States
Major Host:
Butternut (white walnut)
Key Features:
Disease: Fungal spores are spread by rain splash and enter trees through buds, leaf scars, and wounds; cankers eventually girdle and kill the tree.
Damage: Black elliptical cankered areas can be found on branches and trunk. Stem cankers often have inky black centers and a whitish margin. Cankers may develop throughout the tree but commonly occur on the main stem, tree base and on exposed roots.
Control/Management:
Remove and destroy infected trees. Replant with other non-susceptible species.
Butternut (white walnut)
Key Features:
Disease: Fungal spores are spread by rain splash and enter trees through buds, leaf scars, and wounds; cankers eventually girdle and kill the tree.
Damage: Black elliptical cankered areas can be found on branches and trunk. Stem cankers often have inky black centers and a whitish margin. Cankers may develop throughout the tree but commonly occur on the main stem, tree base and on exposed roots.
Control/Management:
Remove and destroy infected trees. Replant with other non-susceptible species.
Selected Images
Invasive Listing Sources
Taxonomic Rank
| Domain: Eukarya |
| Kingdom: Fungi |
| Phylum: Ascomycota |
| Subphylum: Pezizomycotina |
| Class: Sordariomycetes |
| Subclass: Sordariomycetidae |
| Order: Diaporthales |
| Family: Gnomoniaceae |
| Genus: Ophiognomonia |
| Ophiognomonia clavigignenti-juglandacearum |