Begomovirus mucunae

Begomovirus mucunae is a viral pathogen classified within the genus Begomovirus and the family Geminiviridae. This virus possesses a single-stranded DNA genome and causes systemic infections in its host plants. Its primary mode of transmission is through the whitefly (Bemisia tabaci), which acquires and transmits the viral particles while feeding on the phloem sap of infected hosts.

The host range of Begomovirus mucunae predominantly includes various legume species, particularly those in the genus Mucuna. Due to the global cultivation of these plants for fodder or soil improvement, the virus can spread effectively across agricultural landscapes. Furthermore, wild-growing legumes often serve as alternative hosts, acting as reservoirs for the virus throughout the year.

Plants infected with this pathogen typically exhibit symptoms such as distinct foliar mosaic, leaf yellowing, upward or downward curling, and severe distortion of the lamina. Infected specimens often show stunted development, shortened internodes, and a significant reduction in pod set and grain development. These physiological changes ultimately result in substantial yield losses for farmers.

Disease outbreaks are strongly correlated with the population dynamics of the whitefly vector. Environmental conditions that support large populations of Bemisia tabaci, such as warm temperatures and high humidity, significantly increase the risk of rapid virus spread. Once the whitefly acquires the virus, it remains infectious for an extended period, allowing it to transmit the pathogen to multiple healthy plants during its life cycle.

Effective management strategies against Begomovirus mucunae focus on reducing vector pressure and sanitation:

• Implementing strict monitoring programs using yellow sticky traps to detect whitefly presence.
• Applying systemic insecticides to control whitefly populations during critical growth stages.
• Maintaining field hygiene by eliminating weed hosts in the surrounding areas.
• Practicing crop rotation to break the cycle of the vector and the virus.
• Ensuring the use of high-quality, virus-free seeds and planting materials.