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Steve Nix

Thousand Cankers Disease Found On Tennessee Black Walnuts

By September 28, 2010

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TCD Damaged Branch

Thousand Cankers Disease, Missouri Agriculture Image

Thousand cankers disease (TCD) is a newly discovered disease of walnuts including black walnut. The disease results from the walnut twig beetle (Pityophthorus juglandis) hosting a canker producing fungus of the genus Geosmithia (proposed name Geosmithia morbida). TCD was thought to be restricted to the western United States where over the past decade it has been involved in several large scale die-offs of walnut, particularly black walnut, Juglans nigra.

Unfortunately, the canker has now been found in eastern Tennessee in Knox County where there is now a firewood and black walnut quarantine.  According to one University of Colorado entomologist,  a developing colony of TCD "could very possibly develop into an uncontrollable outbreak" and which could "potentially destroy black walnut in its native range". Not good news for black walnut owners.


October 4, 2010 at 4:34 am
(1) Ilyan says:

That is bad news. I am planting Walnuts along my paths hoping to keep them clear of Brambles. And planning to section off my woodlands with Walnuts to find out if the Walnut allopathy(?) might stop the spread of some tree diseases.

Are there other useful plants that producce chemicals that kill plants? I could try them on the opposite side of the tracks, and make a double line when trying sectioning up to improve security.

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