Tobacco streak virus

Tobacco streak virus (TSV) is a plant pathogenic virus classified under the genus Ilarvirus. It is recognized for its broad host range and potential to cause significant economic losses in various agricultural sectors globally, infecting both dicot and monocot species.

The virus impacts a wide variety of crops, including tobacco, tomatoes, sunflower, soybeans, and several legume species. Its ability to infect diverse botanical families makes it a perennial challenge for field management and crop protection specialists worldwide.

Symptoms of TSV infection are diverse and depend largely on the host plant species. They typically include necrotic spotting, streak patterns on leaves, mosaic symptoms, and severe stunting of the plant. In many cases, necrosis of terminal buds and stems is the most destructive manifestation.

• Development of necrotic lesions or ringspots.
• Systemic mosaic patterns on leaves.
• Bud blight and terminal necrosis.
• Severe growth reduction and reduced seed set.

Transmission occurs primarily through infected pollen, mediated by thrips and other insects during the flowering stage. The spread is also facilitated by mechanical contact and contaminated seed stock, making sanitation and vector control essential components of a management strategy.

Effective control involves the use of pathogen-free seeds, weed management to reduce natural reservoirs, and insect control measures. Crop rotation and spatial isolation are recommended to break the cycle of transmission, ensuring that crops remain healthy during critical growth phases.