thousand cankers disease
(Geosmithia morbida)
This species is Native to certain parts of the United States but may be invasive to others
Major Hosts:
Black walnut, butternut, English walnut and English hybrids are susceptible.
Key Features:
Disease and Insect: The Geosmithia fungus forms dark cankers on trunks, stems and branches. Adult beetles 1/16 inch, reddish-brown; larvae white, and C-shaped, found under the bark. Lab assays required for positive identification of the fungus.
Damage: Numerous, small bark beetle entrance and exit holes, galleries under bark, numerous dark cankers under bark, branch flagging, crown dieback, and eventually tree death.
Control/Management:
If you suspect TCD you should contact either the Ohio Department of Agriculture, Ohio Division of Forestry or report it using the Great Lakes Early Detection Network smartphone app. There currently is no recommended treatment other than tree removal and destruction.
Black walnut, butternut, English walnut and English hybrids are susceptible.
Key Features:
Disease and Insect: The Geosmithia fungus forms dark cankers on trunks, stems and branches. Adult beetles 1/16 inch, reddish-brown; larvae white, and C-shaped, found under the bark. Lab assays required for positive identification of the fungus.
Damage: Numerous, small bark beetle entrance and exit holes, galleries under bark, numerous dark cankers under bark, branch flagging, crown dieback, and eventually tree death.
Control/Management:
If you suspect TCD you should contact either the Ohio Department of Agriculture, Ohio Division of Forestry or report it using the Great Lakes Early Detection Network smartphone app. There currently is no recommended treatment other than tree removal and destruction.
Selected Images
Invasive Listing Sources
- Indiana Pest Species
- Iowa Tree Pests
- Maryland Invasive Species Council - Invasive Species of Concern in Maryland
- Michigan’s Invasive Species Watch List
- New York Regulated and Prohibited Invasive Species - Prohibited
- West Virginia Invasive Species Strategic Plan and Volunteer Guidelines 2014
- Wisconsin's Invasive species rule – NR 40
Taxonomic Rank
| Domain: Eukarya |
| Kingdom: Fungi |
| Phylum: Ascomycota |
| Subphylum: Pezizomycotina |
| Class: Sordariomycetes |
| Subclass: Hypocreomycetidae |
| Order: Hypocreales |
| Family: Bionectriaceae |
| Genus: Geosmithia |
| Geosmithia morbida |
References
Common Name Reference: Derived from taxonomy / Generic common name
Scientific Name Reference: Index Fungorum. Paul Kirk. CABI, CBS and Landcare Research. http://www.indexfungorum.org/