Thousand cankers disease in black walnuts appears to have spread outside of one county in Tennessee and has been found in several adjoining counties.


Until recently, it was thought to be confined to the West and Rocky Mountain West.


The fungal disease, which is spread by the walnut twig beetle, is lethal to black walnuts as well as several other closely related walnut species.


Included in the susceptible group are the commercially grown English walnuts.


Read more about the situation in Tennessee by visiting knoxnews.com.


Read more about thousand cankers and its possible impact on commercial walnut production in The Grower's September-October issue.