Thousand Cankers Black Walnut Disease

Scientific name: Geosmithia morbida

Common name: Thousand cankers black walnut disease

Native To: Disease was first detected in the Western U.S..; the disease vector, the walnut twig beetle, is native to the southwestern U.S. and Mexico

Date of U.S. Introduction: First observed in the 1990s, but not recognized until 2008

Images: Invasive.org and Google

Video: Tree Diseases -- includes Thousands Cankers (or click Play button below)

Means of Introduction: Unknown, but the disease can be transmitted by movement of wood infested with the walnut twig beetle

Impact: Fungal disease of walnut trees (Juglans spp.), particularly the black walnut (Juglans nigra), that is usually lethal within a few years; disease is transmitted by the walnut twig beetle, Pityophthorus juglandis

Current U.S. Distribution: Widespread throughout the Western U.S.; first detected in the Eastern U.S. in Aug 2010

Management Plans: Microbes

Selected Internet Resources:

• Federal Government
• State Government
• University/Academic
• International
• Organizations

Geosmithia morbida Article Citation Search - AGRICOLA Database
USDA. National Agricultural Library.
Research

Pathway Assessment: Geosmithia sp. and Pityophthorus juglandis Blackman movement from the western into the eastern United States (Oct 2009; PDF | 4.17 MB)
USDA. Animal and Plant Health Inspection Service.
Photographs; Introduction History; Impacts; Habitat; Distribution; Dispersion

Thousand Cankers Disease
USDA. Forest Service. National Forest Health Monitoring.
Identification/Description; Photographs; Introduction History; Distribution

State Government

Thousand Cankers Disease of Walnut Trees: Frequently Asked Questions
City of Boulder (Colorado). Parks and Recreation.
Identification/Description; Introduction History; Impacts; Distribution; Controls

Thousand Cankers Disease - 2010 Georgia Update (Sep 2010; PDF | 889 KB)
Georgia Forestry Commission.
Introduction/Description; Photographs; Impacts; Distribution; Dispersion

Thousand Cankers Disease
Indiana Department of Natural Resources.
Impacts; Distribution; Legal Aspects

Potential Economic Loss Associated with the Introduction of Thousand Cankers Disease of Black Walnut into Iowa (PDF | 368 KB)
Iowa Department of Natural Resources.
Photographs; Impacts; Controls

Thousand Cankers Disease of Walnut
Kansas Department of Agriculture.
Identification/Description; Photographs; Distribution; Legal Aspects

Thousand Cankers of Black Walnut
Missouri Department of Agriculture. Plant Pest Control Program.
Photographs; Distribution; Legal Aspects

Thousand Cankers Disease of Walnut: Frequently Asked Questions for Missouri (Jun 2010; PDF | 124 KB)
Missouri Department of Conservation. Forest Health Program.
Identification/Description; Impacts; Life Cycle; Habitat; Distribution; Controls

Thousand Cankers Disease
Tennessee Department of Agriculture.
Identification/Description; Photographs; Impacts; Controls; Legal Aspects

Thousand Cankers Disease: A Red Alert for Walnut
Alabama A&M University and Auburn University. Alabama Cooperative Extension System.
Identification/Description; Photographs; Impacts; Distribution; Dispersion

Thousand Cankers Disease of Walnuts: A New Disease in California (May 2010)
University of California - Davis. Statewide Integrated Pest Management Program.
Identification/Description; Photographs; Introduction History; Life Cycle; Controls

Pest Alert: Walnut Twig Beetle and Thousand Cankers Disease of Black Walnut (PDF | 487 KB)
Colorado State University.
Identification/Description; Photographs; Introduction History; Impacts; Distribution; Controls

Thousand Cankers Disease / Walnut Twig Beetle
Colorado State University. Department of Bioagricultural Sciences and Pest Management.
Identification/Description; Photographs; Impacts; Distribution; Controls; Special Note: Powerpoint presentations

Look out for Thousand Cankers Disease in Black Walnut Trees (Feb 2010)
Iowa State University. University Extension.
Identification/Description; Photographs; Introduction History; Dispersion; Controls

Thousand Cankers Disease (Black Walnut Decline) - An Online Guide to Plant Disease Control
Oregon State University. Extension Service.
Identification/Description; Photographs; Introduction History; Habitat; Controls

Forest Health Matters: Thousand Cankers Disease of Walnut
Oregon State University. Extension Service. Master Woodland Managers.
Identification/Description; Photographs; Impacts; Distribution; Dispersion; Controls

Thousand Cankers Disease of Black Walnut: A New Pest May Threaten Texas Walnut Trees (Feb 2010; PDF | 1.46 MB)
Texas A&M University. Texas Forest Service.
Identification/Description; Photographs; Introduction History; Impacts; Life Cycle; Distribution; Dispersion

International

Thousand Cankers Disease Management in Urban Forestry - Draft (Aug 2009; PDF | 25 KB)
Colorado Tree Coalition.
Distribution; Controls

Thousand Cankers Disease
Eastern Forest Environmental Threat Assessment Center.
Identification/Description; Photographs; Impacts; Distribution; Dispersion

Geosmithia spp. and Pityophthorus juglandis
North American Plant Protection Organization. Phytosanitary Alert System.
Taxonomy; Impacts; Distribution; Dispersion

Black Walnut Mortality in Colorado Caused by the Walnut Twig Beetle and Thousand Cankers Disease (Aug 2009; PDF | 345 KB)
Plant Management Network. Plant Health Progress.
Identification/Description; Photographs; Impacts; Distribution

Thousand Cankers Disease
Walnut Council.
Identification/Description; Impacts; Controls