Tomato yellow mosaic

The causal agent of the disease is Begomovirus solanumaureivariati, a virus belonging to the genus Begomovirus within the family Geminiviridae. This viral disease is characterized by the infection of plant tissues, leading to a systemic disease that irreversibly disrupts photosynthesis and metabolic processes within host cells.

The primary hosts affected are plants of the Solanaceae family, predominantly tomatoes, peppers, and potatoes. The virus is highly specific and is transmitted not only by insect vectors but also through agricultural practices that involve wounding plant tissues, allowing the virus to enter the vascular system.

Symptoms of the infection manifest as distinct chlorosis, the appearance of yellow mosaic spots on young leaves, leaf curling, and overall stunted growth of the plant. In severe cases, fruit deformation occurs, significantly reducing marketable quality and the number of fruit sets, which ultimately affects the overall yield productivity.

The spread of the virus in agroecosystems is directly linked to pest populations, particularly the silverleaf whitefly (Bemisia tabaci), which serves as the primary vector of the infection. Optimal conditions for disease outbreaks include high temperatures and low humidity, which facilitate the rapid reproduction and activity of these insect vectors.

To combat the disease and ensure prevention, a comprehensive management strategy is required. This includes the use of resistant hybrids, the eradication of weed reservoirs that harbor the virus, the application of insecticides to control whitefly populations, and the strict maintenance of phytosanitary standards in greenhouses and fields to prevent secondary infection.