Transient mosaic sobemovirus

Transient mosaic sobemovirus (Sobemovirus vtmov) is a viral pathogen belonging to the Sobemovirus genus that causes significant systemic infections in various agricultural crops. As a small, non-enveloped, isometric virus containing single-stranded RNA, it exhibits high stability in the environment, allowing the pathogen to persist in infected plant debris and soil, serving as a primary inoculum source for subsequent growing seasons.

The host range of this virus primarily includes important agricultural families such as Fabaceae and Solanaceae. When these crops are infected, the virus disrupts vital plant metabolic pathways, particularly photosynthesis and nutrient transport. This physiological interference leads to significant reductions in both the quantity and quality of the harvested produce, posing a challenge for farmers in various agro-climatic zones.

Key symptoms associated with Transient mosaic sobemovirus infection include:

• Development of chlorotic mosaics or mottled patterns on leaf surfaces.
• Leaf distortion, curling, and abnormal shape of new growth.
• Significant plant stunting and reduced internode length.
• Reduced flowering capacity and increased rates of flower or fruit drop.
• Discoloration or surface abnormalities on developing fruits.

The transmission of this virus in the field is primarily mediated by insect vectors, including aphids, leafhoppers, or beetles, which acquire the virus while feeding on infected plants and transmit it to healthy ones. Additionally, mechanical transmission can occur during agricultural operations such as pruning, harvesting, or human handling of plants. Environmental conditions that favor the proliferation of these insect vectors significantly increase the rate of viral spread within a field.

Effective management and prevention of this sobemovirus rely on an integrated approach centered on phytosanitary practices. The use of virus-free planting material is the most critical strategy for preventing initial infection. Furthermore, farmers should implement rigorous weed control programs to eliminate alternative hosts and utilize targeted insecticide applications to reduce the populations of insect vectors. Crop rotation and the selection of resistant cultivars are also essential components of a robust disease management program.