Malvastrum leaf curl virus

Begomovirus malvastrumjamaicaense is a plant pathogen belonging to the Geminiviridae family, known for causing severe leaf curl and mosaic diseases. The virus possesses a circular single-stranded DNA genome and relies on specific insect vectors to enter the host plant tissue. Once inside, it systemically colonizes the plant, leading to physiological disruption.

The host range of this virus primarily includes members of the Malvaceae family. Economic impact is significant, especially in regions where cotton, okra, or ornamental mallow plants are cultivated. The virus can lead to stunted growth and total yield loss, as the plant's resources are diverted towards pathogen replication rather than fruit production.

Symptoms typically include yellow mosaic patterns on leaves, interveinal chlorosis, and severe leaf curling or crinkling. The leaves may become thickened and brittle, and the overall plant architecture is stunted due to shortened internodes. In severe infection cases, reproductive development is completely suppressed, leading to poor or no fruit set.

Transmission occurs through the whitefly (Bemisia tabaci), which acts as the primary vector. The virus is acquired by the insect during feeding and can be transmitted to healthy plants within minutes. The rapid reproduction of whiteflies in warm, arid climates creates perfect conditions for the virus to spread across vast fields within a single growing season.

Management strategies focus on breaking the disease cycle by targeting the vector and the infection source. Farmers should implement rigorous weeding programs to eliminate reservoirs of the virus and use systematic insecticides to keep whitefly populations below the threshold. The use of insect-proof nets in greenhouses and selecting resistant cultivars are recommended for sustainable long-term control.