Welcome to TCD Ground Zero!

Black walnut is native to much of the eastern U.S., where it is found in many rural and urban areas. It is an important economic forest (valued for wood -- lumber and veneers) and food (valued for nutmeat) resource. Standing black walnut is valued at $569 billion. A new disease called thousand cankers disease, which has killed thousands of trees, now threatens the health and survival of black walnuts in the U.S., particularly in its native range. This disease also has affected other walnut species, including Arizona walnut, English walnut, and California walnut, with varying degrees of susceptibility.

Thousand cankers disease is caused by a canker-producing fungus (Geosmithia morbida) which is carried by the walnut twig beetle (Pityophthorus juglandis). Our goal is to share information on this potentially devastating disease to enhance knowledge to reduce its spread and impact on black walnut.


(For more information about these materials please contact Jerome Grant at

Atri-fold pamphlet titled ‘Walnut Alert! Black Walnuts Are Dying’ is now available! You may request copies of this pamphlet or you may download the pdf document of the pamphlet and modify it to fit your local needs. Help spread the word and educate everyone about thousand cankers disease and its potential devastating impact to black walnuts in their native range.

A pocket-sized (ca. 3 in x 3.5 in) (printed front and back) ‘Thousand Cankers Disease and Walnut Twig Beetle Identification Guide’ is now available! You may request copies of this Guide or you may download the Word/pdf document and modify it to fit your local needs. This Guide is easily distributed and can aid in the identification of potential infected/infested black walnut trees by foresters, state and federal employees, and the general public.

A stand-alone, pop-up banner (7 feet tall) titled ‘Walnut Alert’ is now available! You may request one banner, which will be provided depending upon availability (supplies are limited). Also, you may request an electronic copy of the banner, so you can add your own logo, modify the text to fit your local needs, and print it for your individual needs.  These banners are easily displayed at industry meetings, county meetings, county and state fairs, in office buildings, in your building, etc. The

banners provide a passive avenue for us to share information about thousand cankers disease with the general public, endusers, and others.


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