Malvastrum yellow mosaic virus

Malvastrum yellow mosaic virus (Begomovirus malvastri) is a plant pathogenic virus belonging to the genus Begomovirus within the Geminiviridae family. This virus is known for causing significant damage to various botanical species, negatively affecting plant physiological processes and yield quality.

The primary hosts for this virus are plants in the Malvaceae family, particularly species of the Malvastrum genus. In agricultural settings, it can also infect cotton and other related commercial crops, posing a serious threat to regional agriculture depending on the environmental conditions and the presence of vectors.

The symptoms of infection typically include severe leaf curling, stunted growth, and distinct yellow mosaic or chlorotic patterns on the foliage. Infected plants exhibit shortened internodes and significant yield losses due to reduced photosynthetic activity and failure to produce healthy flowers or fruits.

Transmission occurs primarily through the whitefly (Bemisia tabaci), which acts as a vector by acquiring the virus from infected plants and transmitting it to healthy ones. The efficiency of transmission is highly dependent on whitefly population density and temperature, which often leads to rapid outbreaks in warm climates.

Management and prevention focus on controlling the whitefly population through the use of systemic insecticides and integrated pest management (IPM) practices. Key strategies include:

• Elimination of alternative weed hosts that serve as virus reservoirs.
• Use of insect-proof netting in greenhouse and nursery environments.
• Implementation of strict phytosanitary measures for crop residues.
• Planting of resistant or tolerant cultivars where available.
• Regular monitoring of vector populations to time pesticide applications.