Jute leaf curl virus

The causal agent of this disease is Begomovirus corchovenae, a member of the Geminiviridae family. As a typical begomovirus, it is characterized by its transmission mechanism, where it is vectored by whiteflies (Bemisia tabaci) in a persistent, circulative, and non-propagative manner. The virus causes systemic infection, hijacking the host plant's replication machinery to produce viral proteins.

The primary host for this virus is jute (Corchorus spp.), an essential crop grown for its fiber. The disease is highly specific to the Corchorus genus. By inducing physiological stress in the plant, the virus disrupts the development of tissues required for strong and high-quality fiber formation, posing a significant threat to global fiber production regions.

Typical symptoms of infection include severe leaf curling, rugosity, and leaf yellowing (mosaic). Infected plants exhibit significant stunting, with shortened internodes and deformed leaves. In severe cases, the entire plant canopy becomes twisted, significantly reducing the surface area available for photosynthesis and leading to a collapse in biomass production.

Development and spread of the virus are heavily influenced by environmental conditions that favor whitefly populations.

• High temperatures accelerate both the virus's transmission cycle and the insect's life cycle.
• Weed hosts in surrounding areas act as natural reservoirs for the virus.
• Drought conditions often encourage whitefly migration into the lush, irrigated jute fields, facilitating rapid spread.

The economic damage caused by Begomovirus corchovenae is reflected in both decreased fiber yield and poor fiber quality. Effective prevention requires a multipronged approach: the development and planting of virus-resistant jute varieties, the rigorous application of systemic insecticides to manage whitefly populations, and the implementation of strict field sanitation practices to eliminate virus-infected debris and alternative weed hosts.