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United States Department of Agriculture

Forest Health News 2018

2018 GUIDELINES for the National Thousand Cankers Disease Survey ARE NOW AVAILABLE

By Bruce Moltzan, USDA Forest Service

March 2018

Thousand Cankers Disease

Black walnuts recently killed by thousand cankers. Photo by: Curtis Utley, CSUE.

The 2018 guidelines for the National Thousand Cankers Disease (TCD) survey are now available from the United States Department of Agriculture: Forest Service and Plant Protection & Quarantine. These guidelines provide guidance on standardized techniques for USDA-supported surveys to detect TCD on symptomatic walnut. The combined activity of the fungus, Geosmithia morbida, and the walnut twig beetle, Pityophthorus juglandis, cause numerous cankers in association with insect galleries, causing mortality on black walnut. Although TCD is native to portions of the southwestern United States, the true distribution of this complex across the country is not known. To date, TCD is confirmed in 16 states across the country. States with significant walnut resources have issued phytosanitary regulations restricting the movement of walnut out of and within areas known to have the disease. This survey continues to support state regulations. Black walnut, Juglans nigra, is a significant economic, social, and environmental resource and appears to be highly susceptible to TCD. New information on lure procurement is added to this year’s guidelines.


Up to date guidelines for the National Thousand Cankers Disease (TCD) survey

For more information about TCD, please visit or contact:
Bill Wesela, National Policy Manager, USDA APHIS, 301-851-2229, Bruce Moltzan, National Program Leader: Forest Pathology, USDA Forest Service, 703- 605-5336,