Abutilon mosaic

Abutilon mosaic is a significant viral disease caused by the Abutilon mosaic virus (AbMV), often associated with the Malvaceous chlorosis virus complex. Belonging to the Geminiviridae family, this pathogen causes systemic infection within the host plant, severely disrupting vascular function and overall development by interfering with the plant's metabolic pathways.

The virus has a notable host range that includes various ornamental species and critical agricultural crops, most importantly cotton (Gossypium). Because it infects members of the Malvaceae family, it poses a direct economic threat to cotton production regions, potentially causing significant yield losses if left uncontrolled in field or greenhouse conditions.

The primary symptoms of the disease are characterized by striking chlorosis in the form of yellow or cream-colored mosaic patterns on leaves. Affected leaves often exhibit curling, crinkling, and distortion. In addition to visual symptoms, infected plants show stunted growth, reduced leaf surface area, and a general decline in vigor, which directly impacts the plant's ability to produce flowers, fruit, or fiber.

The transmission of the disease in nature is primarily mediated by the silverleaf whitefly (Bemisia tabaci). The insect acquires the virus while feeding on infected sap and transmits it to healthy plants during subsequent feeding sessions. In artificial environments, such as nurseries, the virus is frequently spread through the vegetative propagation of infected plant material, ensuring that every cutting remains a carrier of the pathogen.

Management and prevention require an integrated approach to break the disease cycle. Recommended actions include:

• Implementing strict vector control measures to suppress whitefly populations using targeted insecticides and physical barriers.
• Sourcing only virus-free, indexed propagating material to prevent initial outbreaks.
• Promptly identifying and roguing (removing) infected plants to prevent them from becoming inoculum sources for further spread.
• Maintaining high phytosanitary standards in greenhouses, including the regular cleaning of tools and sterilization of growing areas.