Black shank
scouted June 23, 2026
- Scientific Name
- Phytophthora nicotianae
- Background
- A tobacco field, variety NC991, planted on 4/18/2026, was being scouted, and it was observed that 1% of the field was affected by browning, yellowing, and wilting. The field has a history of black shank, which led to spraying with Recon Bold. Plants have been under drought stress, and symptom onset started 5 days before 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
