Yellow spot of solanaceous crops

The causal agent of this plant disease is Begomovirus solanumflavusmaculae, a member of the Geminiviridae family. This virus causes systemic infection, disrupting plant growth regulators and severely impacting the structural integrity of the affected tissues.

The virus primarily impacts the Solanaceae family. Key crops susceptible to the disease include tomatoes, potatoes, bell peppers, and eggplants. Wild weeds within the same family frequently serve as alternative hosts, maintaining the virus in the environment throughout the growing season.

Typical symptoms of infection include chlorotic yellow spots on leaves, mosaic patterns, and significant leaf curling. Stunting of the entire plant is commonly observed, leading to reduced internode length, poor flower set, and small, low-quality fruit that are unsuitable for commercial sale.

Transmission of the pathogen is mediated by whitefly vectors, specifically Bemisia tabaci. The spread of the disease is highly correlated with environmental conditions, as warm and dry weather accelerates the life cycle of the whitefly, leading to rapid disease dissemination across the field.

Management of this viral infection is challenging and requires an integrated approach. Because there are no direct chemical controls for the virus itself, protective strategies are essential:

• Rigorous control of whitefly populations using biological and chemical insecticides.
• Strict field sanitation and removal of infected plants to minimize inoculum.
• Implementation of quarantine and spatial isolation measures for susceptible crops.
• Utilization of virus-indexed, certified disease-free transplants.
• Breeding and planting of resistant varieties to limit the impact of the viral spread.