Sida golden mosaic virus

Causal agent and disease type: The disease is caused by Begomovirus sidavenae, a member of the Geminiviridae family. As a viral plant pathogen, it invades the vascular system of the host, causing systemic infection that disrupts the plant's physiological functions and metabolic integrity.

Host range: The primary hosts for this virus are plant species within the Malvaceae family, specifically those in the genus Sida. However, due to the broad host range of many begomoviruses, there is a risk of spillover infection to related crops like cotton (Gossypium) and okra, which are economically sensitive to geminivirus outbreaks.

Symptoms and signs: The characteristic symptom is a vibrant golden mosaic pattern on the leaf surface, often accompanied by leaf curling, crinkling, and stunted growth. Infected plants exhibit a significant reduction in leaf size and poor reproductive performance, indicating severe stress caused by the systemic spread of viral particles.

Conditions for development and severity: The virus is transmitted in a persistent, circulative manner by the whitefly Bemisia tabaci. The disease thrives in warm and humid environments, which promote large whitefly populations. The severity of the damage is reflected in stunted plant architecture, reduced photosynthetic capacity, and ultimately, substantial yield losses in susceptible populations.

Protection and control measures: Mitigation strategies focus on interrupting the disease cycle:

• Stringent management of whitefly populations through regular insecticide applications.
• Removal and destruction of weeds and alternative hosts around the fields.
• Implementation of spatial and temporal crop separation to limit spread.
• Use of protected cultivation, such as fine-mesh screening, to exclude vectors.
• Adherence to strict phytosanitary protocols to prevent the movement of infected plant material.