Begomovirus sidavariati

Begomovirus sidavariati is a viral plant pathogen belonging to the genus Begomovirus within the Geminiviridae family. This virus is characterized by a circular single-stranded DNA genome and poses a significant threat to agriculture globally, particularly in tropical and subtropical regions where the environmental conditions support its vectors.

The virus primarily affects plant species within the Malvaceae and Solanaceae families. Key economic crops such as cotton, tomatoes, and various vegetables are highly susceptible to infection. The pathogen is transmitted in a persistent circulative manner by the whitefly Bemisia tabaci, which acquires the virus while feeding on infected plant phloem and subsequently transmits it to healthy plants.

Clinical signs of infection include chlorotic mosaic patterns, leaf curling, crinkling, and significant stunting. Plants infected with Begomovirus sidavariati often exhibit abnormal flower development and reduced fruit set. The disruption of physiological processes leads to a decline in photosynthetic efficiency, directly impacting the overall vigor and productivity of the crop.

The development and spread of this disease are heavily linked to the population dynamics of its insect vector. Warm temperatures and high humidity promote rapid whitefly reproduction, accelerating the secondary spread of the virus throughout the fields. During off-seasons, the virus resides in alternative weed hosts, ensuring its survival until the next planting cycle.

Management of the disease is challenging as there are no chemical virucides. Therefore, control strategies must prioritize integrated pest management (IPM) to prevent the spread of the vector and minimize initial infection rates:

• Deployment of virus-resistant or tolerant crop varieties.
• Rigorous weed control to eliminate virus reservoirs.
• Strategic application of insecticides to manage whitefly populations.
• Implementation of physical barriers like fine-mesh nets for seedlings.
• Establishing spatial isolation and crop-free periods to break the viral cycle.