TSWV
scouted May 29, 2026
- Scientific Name
- Tomato spotted wilt virus
- Background
- A tobacco field was being scouted, and it was observed that 20% of the field was affected by blight, defoliation, browning, yellowing, reddening, leaf spots, malformation, and wilting in patches across the field. The field is a sunny site in a low area. 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,n 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
