Tomato leaf curl Solanum Delhi virus

The causative agent of the disease is a virus from the Begomovirus genus, identified as Solanum delhiense-secundi. As a DNA-based virus, it disrupts the internal plant physiology, leading to systemic infection. This disease is classified as a severe viral pathology that impacts the overall development and yield potential of host plants.

The primary hosts for this virus are plants within the Solanaceae family, including tomatoes, peppers, and eggplants. The pathogen is highly adaptable and can survive in various weed species, which act as reservoirs and maintain the viral load within the environment throughout the growing season.

Symptoms of the infection manifest as leaf curling, chlorosis, and severe mosaic patterns on the foliage. Infected plants typically show signs of stunting and reduced internode length. The development of reproductive organs is heavily hindered, leading to flower drop and significant fruit malformation or total loss of production.

Transmission occurs primarily through the whitefly vector, specifically Bemisia tabaci. The spread of the disease is exacerbated by warm and dry climatic conditions, which are ideal for rapid whitefly population growth. Once a vector acquires the virus, it remains capable of transmitting the pathogen throughout its lifespan.

Effective management strategies require an integrated approach. The most critical measures include controlling whitefly populations using systematic insecticides and maintaining rigorous phytosanitary standards.

• Eliminate alternative weed hosts in and around fields.
• Use certified virus-free seeds and seedlings.
• Implement physical barriers such as insect-proof netting in greenhouses.
• Remove and destroy symptomatic plants immediately to prevent further spread.