TSWV
scouted June 30, 2026
- Scientific Name
- Tomato spotted wilt virus
- Background
- A tobacco field in Greene County was being scouted, and it was observed that some of the field was being affected by browning, yellowing, scorch/burn, and stem rot in patches across the field. There was also evidence of insect chewing. A sample was submitted to the PDIC for diagnosis.
- Conclusion
- The issue was identified as Tomato Spotted Wilt Virus (TSWV) on tobacco. This disease is caused by a virus in the Orthotospovirus genus and is transmitted by thrips, primarily tobacco thrips (Frankliniella fusca) and western flower thrips (F. occidentalis). Not all infected tobacco plants develop symptoms, and severity can range from mild to severe. Symptoms typically appear 2 to 3 weeks after infection, which makes early detection difficult. Common symptoms include necrotic spots and concentric rings that initially appear yellow and later turn brown. There is no cure for TSWV, but reducing thrips populations through chemical and cultural practices can help limit disease spread.
- Resources