TSWV
scouted June 2, 2026
- Scientific Name
- Tomato spotted wilt virus
- Background
- A tobacco field, variety 196, was being scouted, and it was observed that some of it was wilting. There's a suspicion of TSWV; a sample was submitted to the PDIC to confirm the 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
