Thousand Cankers Disease
Thank you for choosing Ask an Expert for information about Thousand Cankers Disease of walnuts. This disease is found in Oregon as well as in other western states.
Thousand Cankers, a fungus, is spread by the walnut twig beetle and has been identified in our area since the early 2000s. For a full account of the damage this disease does, along with details on its life cycle and controls, see here: https://pnwhandbooks.org/plantdisease/host-disease/walnut-juglans-spp-thousand-cankers-disease-black-walnut-decline