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You are here: Home / Microbes / Species Profiles / Thousand Cankers Black Walnut Disease
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Thousand Cankers Black Walnut Disease

Thousand cankers - Invasive.orgScientific name: Geosmithia morbida

Common name: Thousand cankers black walnut disease

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Spotlight:

  • Thousand Cankers Disease (TCD) Survey Guidelines Now Available (March 2013)
    USDA. Animal and Plant Health Inspection Service.
    In cooperation with the U.S. Forest Service, APHIS Plant Protection and Quarantine has updated the Thousand Cankers Disease Survey Guidelines for 2014 (Apr 2014; PDF | 11.0 MB). TCD results from the combined activity of Geosmithia morbida fungus and the walnut twig beetle (WTB, Pityophthorus juglandis).

Selected Resources

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 (Utley et al. 2013)

Date of U.S. Introduction: First observed in the 1990s, but not recognized until 2008 (Utley et al. 2013)

Means of Introduction: Unknown, but possibly through the transportation of logs and firewood (Randolph et al. 2013)

Impacts: 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 (Tisserat et al. 2009)

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

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Partnership

Phytosanitary Alert System - Geosmithia spp. and Pityophthorus juglandis
North American Plant Protection Organization.

National Pest Alert: Thousand Cankers Disease of Walnut (PDF | 1.95 MB)
North Central Integrated Pest Management Center.

Thousand Cankers Disease
Vermont Invasives.

Thousand Cankers Disease
European and Mediterranean Plant Protection Organization.

Government

Thousand Cankers Disease
USDA. Animal and Plant Health Inspection Service.

Thousand Cankers Disease
USDA. FS. National Forest Health Monitoring.

Pest Alert: Thousand Cankers Disease
USDA. FS. Northeastern Area.

State

Thousand Cankers Disease - 2010 Georgia Update (Sep 2010; PDF | 889 KB)
Georgia Forestry Commission.

Thousand Cankers Disease and the Walnut Twig Beetle (PDF | 2.81 MB)
Illinois Department of Agriculture.

Thousand Cankers Disease of Walnut
Kansas Department of Agriculture.

Thousand Cankers Disease of Walnut
Kansas Forest Service.

Thousand Cankers Disease
Missouri Department of Conservation.

Thousand Cankers Disease of Walnut
Minnesota Department of Agriculture.

Thousand Cankers Disease
Tennessee Department of Agriculture.

Thousand Cankers Disease
Wisconsin Department of Natural Resources.

Academic

Thousand Cankers Disease and the Walnut Twig Beetle in California (May 2010)
University of California. Statewide Integrated Pest Management Program.

Thousand Cankers Disease / Walnut Twig Beetle
Colorado State University. Department of Bioagricultural Sciences and Pest Management.

Thousand Cankers Disease: A Threat to Black Walnut in Florida
University of Florida. Institute of Food and Agricultural Sciences.

Thousand Cankers Disease (2013; PDF | 625 KB)
Ohio State University. Extension.

Thousand Cankers Disease (Black Walnut Decline) - An Online Guide to Plant Disease Control
Oregon State University. Extension Service.

Forest Health Matters: Thousand Cankers Disease of Walnut
Oregon State University. Extension Service. Master Woodland Managers.

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.

Thousand Cankers Disease of Walnut (Aug 2011; PDF | 1.65 MB)
Utah State University. Cooperative Extension.

Professional

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

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.

Thousand Cankers Disease
Walnut Council.

Citations

Randolph, K.C., A.K. Rose, C.M. Oswalt, and M.J. Brown. 2013. Status of black walnut (Juglans nigra L.) in the eastern United States in light of the discovery of thousand cankers disease. Castanea 78(1):2-14.

Tisserat, N., W. Cranshaw, D. Leatherman, C. Utley, and K. Alexander. 2009. Black walnut mortality in Colorado caused by the walnut twig beetle and thousand cankers disease. Plant Health Progress.

Utley, C., T. Nguyen, T. Roubtsova, M. Coggeshall, T.M. Ford, L.J. Grauke, A.D. Graves, C.A. Leslie, J. McKenna, K. Woeste, M.A. Yaghmour, W. Cranshaw, S.J. Seybold, R.M. Bostock, and N. Tisserat. 2013. Susceptibility of walnut and hickory species to Geosmithia morbida. Plant Disease 97(5):601-607.

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Last Modified: Mar 20, 2015
 
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