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APHIS Releases 2020 Thousand Cankers Disease Survey Guidelines

The 2020 Thousand Cankers Disease (TCD) Survey Guidelines are now available on the APHIS website.  

TCD is a disease complex that threatens millions of black walnut trees (Juglans nigra) in forests and urban areas in the United States. The disease is the result of the combined activity of a fungus (Geosmithia morbida) and the walnut twig beetle (Pityophthorus juglandis). 

For more information about TCD, please visit or contact:

Bill Wesela, National Policy Manager, 301-851-2229,

Bruce Moltzan, National Program Leader: Forest Pathology, 703- 605-5336,

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