Thousand Cankers Black Walnut Disease
University of Georgia. Center for Invasive Species and Ecosystem Health.Provides state, county, point and GIS data. Maps can be downloaded and shared.
Google. YouTube; University of Massachusetts - Amherst.
Google. YouTube; University of Tennessee Extension (Knoxville County).
The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Thousand Cankers Black Walnut Disease.
National Plant Diagnostic Network.
North Central Integrated Pest Management Center.
See also: Pest Alerts for more resources
North American Plant Protection Organization.
USDA. FS. Northeastern Area State and Private Forestry.
USDA. FS. Northern Research Station.
State and Local Government
Georgia Forestry Commission.
Minnesota Department of Agriculture.
Indiana Department of Natural Resources. Entomology and Plant Pathology.
- Don't transport firewood, even within Tennessee.
- Don't buy or move firewood from outside the state.
- Watch for signs of infestation in your walnut trees.
Maryland Department of Agriculture.
Thousand cankers disease (TCD) is a disease complex native to the western United States and primarily affects black walnut, Juglans nigra. This disease is the result of the combined activity of a fungus, Geosmithia morbida, and the walnut twig beetle WTB), Pityophthorus juglandis. On January 12, 2015, the the Maryland Secretary of Agriculture issued a quarantine order to minimize the risk of moving infested material out of the limited action area in Cecil County, and to provide confidence in Maryland walnut products moving into neighboring states from non quarantined areas. The 2015 quarantine order has been updated to include all of Baltimore City and part of Baltimore County (PDF | 1.2 MB). The new quarantine (PDF | 1.0 MB) was signed on May 1, 2019 by the Maryland Secretary of Agriculture.
- Kolařík, M., E. Freeland, C. Utley, and N. Tisserat. 2011. Geosmithia morbida sp. nov., a new phytopathogenic species living in symbiosis with the walnut twig beetle (Pityophthorus juglandis) on Juglans in USA. Mycologia 103(2):325-332.
- Randolph, K.C., A.K. Rose, C.M. Oswalt, and M.J. Brown. 2013. Status of black walnut (Juglans nigra L.) in the eastern United States in light of the discovery of thousand cankers disease. Castanea 78(1):2-14.
- Tisserat, N., W. Cranshaw, D. Leatherman, C. Utley, and K. Alexander. 2009. Black walnut mortality in Colorado caused by the walnut twig beetle and thousand cankers disease. Plant Health Progress.
- Utley, C., T. Nguyen, T. Roubtsova, M. Coggeshall, T.M. Ford, L.J. Grauke, A.D. Graves, C.A. Leslie, J. McKenna, K. Woeste, M.A. Yaghmour, W. Cranshaw, S.J. Seybold, R.M. Bostock, and N. Tisserat. 2013. Susceptibility of walnut and hickory species to Geosmithia morbida. Plant Disease 97(5):601-607.