Solanum leaf curl begomovirus

Pathogen and disease type. Begomovirus solanumvariati is a viral pathogen classified within the Begomovirus genus of the Geminiviridae family. It is a highly destructive plant virus that infects the vascular system, leading to systemic infection. Unlike fungal diseases, viral pathogens cannot be treated with fungicides, making prevention the only viable strategy.

Affected crops. This virus primarily targets members of the Solanaceae family. Major commercial crops susceptible to the infection include tomatoes, potatoes, bell peppers, and eggplants. The virus often persists in perennial weeds, which act as secondary hosts and reservoirs throughout the growing season.

Symptoms and signs. Typical symptoms include severe curling and crinkling of leaves, often accompanied by chlorosis and yellowing. Infected plants exhibit stunted growth, reduced internode length, and a bush-like appearance. Flowers may abort, and fruit production is significantly reduced, with any remaining fruits showing signs of deformation or stunted development.

Development and impact. The virus is transmitted in a persistent, circulative manner by the whitefly (Bemisia tabaci). Environmental conditions such as warm, dry weather favor the rapid proliferation of the whitefly population, facilitating the spread of the virus across fields. The economic impact is devastating, often leading to total crop failure in heavily infested areas.

Control and prevention measures. Management depends on an integrated pest management (IPM) approach to minimize the impact of the whitefly vector:

• Selection and use of virus-resistant or tolerant crop varieties.
• Implementation of strict insecticide spray programs to manage whitefly populations.
• Prompt removal and destruction of symptomatic plants to reduce the local viral load.
• Control of weeds in and around the fields to eliminate alternate hosts.
• Utilization of physical barriers like fine mesh screens in greenhouses to prevent vector entry.