Cassava Cameroon begomovirus

Cassava Cameroon begomovirus (Begomovirus manihotiscameroonense) is a viral pathogen that primarily targets cassava plants (Manihot esculenta). As a member of the Geminiviridae family, this virus is closely associated with the mosaic disease complex, which significantly hampers agricultural productivity in tropical regions, particularly in Central and West Africa.

The transmission of this virus is primarily biological, mediated by the whitefly Bemisia tabaci. When whiteflies feed on the phloem of infected cassava, they acquire the virus and subsequently transmit it to healthy plants. This mechanism of transmission allows the virus to spread rapidly across fields, especially during seasons when whitefly populations are high.

Symptoms of an infection are characterized by severe leaf mosaic, curling, and distortion. Infected plants typically display chlorosis (yellowing of leaf tissues), which severely limits the photosynthetic capacity of the plant. Consequently, this leads to stunted growth, reduced canopy development, and an overall lack of vigor compared to healthy cassava stands.

The economic impact of the disease is profound, as it directly affects the formation of storage roots. Severe infections result in a dramatic reduction in harvestable tuber yield. Furthermore, since cassava is propagated via stem cuttings, the virus can easily be passed on to the next generation if infected material is used for planting, creating a cycle of infection that is difficult to break.

• Implementation of phytosanitary measures to ensure the use of virus-free planting stock.
• Effective whitefly management strategies using integrated pest management (IPM) practices.
• Immediate rogueing (removal and destruction) of symptomatic plants to limit primary spread.
• Development and distribution of virus-resistant cassava cultivars.
• Field sanitation and maintaining distance from previously infected cultivation areas.