Disease on crop
fungalThousand Cankers Disease on black walnut
Geosmithia morbida (vectored by Pityophthorus juglandis)
Fatal disease of black walnut caused by a fungus vectored by the walnut twig beetle. Spreading eastward from the western US, devastating native black walnut stands.
- Disease
- Thousand Cankers Disease
- Pathogen type
- Fungal
- Crop
- Black Walnut
- Scientific name
- Geosmithia morbida (vectored by Pityophthorus juglandis)
Thousand Cankers Disease on black walnut
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Symptoms on black walnut
- ▸ Yellowing and thinning canopy
- ▸ Tiny pinhole beetle entry points on branches
- ▸ Coalescing dark cankers under bark when scratched
- ▸ Branch dieback progressing to whole-tree death over 3-5 years
IPM controls
- ✓ No effective treatment once symptomatic; prompt removal and burning of infected trees
- ✓ Avoid moving black walnut firewood across regions (the primary spread vector)
- ✓ Maintain tree vigor (drought-stressed trees are more susceptible)
- ✓ Report suspected cases to state forestry departments
Other crops affected by thousand cankers disease
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