Evaluating the Antiviral Efficacy of Fiscion 0.1% SL Against Tomato spotted wilt virus (TSWV) in Greenhouse Tomatoes

Document Type : Pest Management

Author

Plant virology department, Iranian research plant protection institute, Agricultural Research, Education and Extension Organization, Tehran

Abstract

Tomato spotted wilt virus (TSWV) is a significant and damaging pathogen in global tomato production. With a broad host range and natural transmission by thrips. TSWV causes severe symptoms, including dark brown lesions and necrotic tissue on fruit. Current management strategies are limited to thrips control and roguing infected plants, highlighting the need for effective antiviral solutions. This study investigated the efficacy of the plant antiviral compound Fiscion 0.1% SL in inhibiting TSWV activity and replication within tomato plants. Trials were conducted under both research and commercial greenhouse conditions in Qazvin and Alborz provinces. A randomized complete block design was employed with five treatments and four replications: Fiscion 0.1% SL at 2.5 L/ha, Fiscion 0.1% SL at 2.0 L/ha, Fiscion 0.1% SL at 1.5 L/ha, Control (water spray only) and absolute control (no spray). The antiviral was applied filially to adult plants in three stages: at bud opening, after flower drop/fruit formation, and 2-3 weeks after the second application. Disease severity and infection percentage were evaluated 14 and 35 days after the final spray. Additionally, viral infection was quantitatively assessed via ELISA using virus-specific antiserum. Data analysis revealed that the 2.0 L/ha dose was the most effective treatment. It demonstrated a 78.44% efficacy in reducing infection rates and a 66.57% reduction in disease severity compared to the control. Based on these results, the application of Fiscion 0.1% SL at a concentration of 2.0 L/ha is recommended for the management of TSWV upon initial symptom observation in greenhouse tomato crops.

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References

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Applied Entomology and Phytopathology
Volume 93, Issue 2
March 2026
Pages 234-242

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