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Walnut Twig Beetle
Thousand cankers is a recently recognized disease of certain walnuts (Juglans spp.). The disease results from the combined activity of the walnut twig beetle (Pityophthorus juglandis) and a canker producing fungus in the genus Geosmithia (proposed name Geosmithia morbida). At present (2009) the disease is 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.
Tisserat, N., W. Cranshaw, D. Leatherman, C. Utley, and K. Alexander. 2009. Black walnut mortality caused by the walnut twig beetle and thousand cankers disease. Plant Health Progress. August 11, 2009. 10 pp. (This is the original description of the disease in a peer reviewed journal.)
Thousand Cankers Disease: An Unusual Paradigm – June 2011, American Nurseryman
PowerPoint Presentations on Thousand Cankers Disease / Walnut Twig Beetle Walnut in the West:
Thousand Cankers Disease: Overview and Origins. Whitney Cranshaw. Presented in Charlottesville, VA in July 2012 at the Southern Forest Insects Work Conference
Diagnosing Thousand Cankers Disease. Ned Tisserat May 2011
Thousand Cankers Disease – Annapolis. Ned Tisserat. January 2011
Nightmare on Walnut Street: Thousand Cankers Disease as an Emergent Threat to Juglans. Whitney Cranshaw. Presented at the International Society of Arboriculture Conference, Chicago, IL July 27, 2010
Walnut in the West: Death by a Thousand Cankers. Ned Tisserat. July 21, 2010
Issues Surrounding Thousand Cankers Disease and Its Management. Whitney Cranshaw. Presented at the First Conference on Thousand Cankers of Walnut, St. Louis, MO November 3, 2009