Black shank
scouted Aug. 6, 2026
- Scientific Name
- Phytophthora nicotianae
- Background
- A tobacco field in Jones County was being scouted, and it was observed that 50% of the field was affected by blight, canker, dieback, blackening, yellowing, root rot, stem rot, and wilting in patches. These issues were widespread. The field is in a high and sunny area. A sample was submitted to the PDIC for diagnosis.
- Conclusion
- The issue was identified as black shank of tobacco. This disease is caused by the soil-borne oomycete Phytophthora nicotianae and is one of the most destructive and widespread tobacco diseases in North Carolina. Black shank is favored by warm temperatures and wet soil conditions and can persist in soil for several years. The disease can occur at any growth stage of tobacco. The most common symptoms are root and crown rot, which lead to yellowing, wilting, and eventual plant death. An integrated management approach using resistant varieties, cultural practices, and chemical or biological controls is recommended to reduce long-term damage from black shank.
- Resources