Target Spot
scouted April 16, 2026
- Scientific Name
- Rhizoctonia solani
- Background
- A tobacco greenhouse (Variety NC 960) was being scouted, and it was observed that 20% was affected by yellowing, damping off, and root rot. It was observed that it started from 1-2 trays but spread to adjacent trays. A sample was submitted to the PDIC for diagnosis.
- Conclusion
- The issue was identified as Target Spot of tobacco. This disease is caused by the soil-borne fungal pathogen Rhizoctonia solani, a species complex that includes several anastomosis groups, with AG2-2, AG3, and AG4 affecting tobacco. Symptoms include small white to tan spots that develop on lower leaves near the soil surface. As the disease progresses, spots enlarge and develop darker brown concentric rings, giving the lesions a target-like appearance. The pathogen can survive in soil and crop debris, and disease development is favored by warm and humid conditions. Variety resistance has not been assessed for this disease. Management of target spot relies on a combination of cultural practices and chemical controls.
- Resources
