Thousand Cankers Disease

Missouri Thousand Cankers Disease State Exterior Quarantine

(Please be aware that there is a threat to walnut trees. Please call your local tree professional or the Missouri Dept. of Conservation if you see any unusual decline in your walnut trees so that they can be evaluated.)

Collin Wamsley, State Entomologist, announces effective Monday, April 12, 2010 thru January 19, 2011 an emergency rule on Missouri Thousand Cankers Disease. “We hope this is one of many steps that will help protect Missouri’s black walnut resource. A permanent rule is ongoing. Let me know if you have questions, comments or concerns. Collin can be contacted at phone 573.751.5505/5507 or email at [email protected] Meanwhile, the U.S. Forest Service is leading the development of a National Response Framework for Thousand Cankers Disease on Walnut, which has significant involvement from Missouri. Also, tremendous efforts are underway in the research arena in pheromone development for survey, treatment options, resistant germplasm identification, and much more.”

Thousand Cankers Disease (TCD) is a pest complex that is causing mortality in walnut in many western states. It is caused by the walnut twig beetle (Pityophthorus juglandis) and an associated fungus (Geosmithia sp. nov.). Black walnut (Juglans nigra) is highly susceptible to this disease, but TCD has not yet been found in the native range of black walnut. For more information visit the website

Following is a copy of the Emergency Rule on Thousand Cankers Disease of Walnut

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