Comoros tobacco begomovirus

Comoros tobacco begomovirus (Begomovirus nicotianacomorosense) is a viral plant pathogen belonging to the Geminiviridae family. The virus is characterized by a circular single-stranded DNA genome and is primarily known for causing systemic infections in host plants. As a plant pathogen, it disrupts host cellular processes, leading to significant physiological stress and reduced agricultural yield.

The virus predominantly affects plants within the Solanaceae family, with a specific focus on tobacco (Nicotiana species) and related agricultural crops like tomatoes and peppers. First documented on the Comoros Islands, this virus has become a subject of interest for plant pathologists studying the diversity of begomoviruses in tropical and subtropical island ecosystems.

The disease manifests through a variety of characteristic symptoms that typically involve foliage and stunted development:

• leaf chlorosis and interveinal mosaic patterns;
• severe leaf curling and distortion of the canopy;
• general stunting and reduction in overall plant height;
• decreased reproductive success and abnormal flower formation.

Transmission of this virus is mediated by whiteflies (Bemisia tabaci), which act as efficient insect vectors. The virus is acquired during feeding and is transmitted in a persistent circulative manner. Environmental factors, such as high temperatures, play a critical role in the population dynamics of the whitefly vector, thereby directly influencing the rate of viral spread within crop populations.

Management strategies for this begomovirus are primarily preventative due to the absence of curative treatments for infected plants. Effective control includes monitoring whitefly populations, using trap crops, implementing strict weed control measures to remove alternative viral hosts, and utilizing certified disease-free transplants. Crop rotation and resistant cultivar development remain the most sustainable long-term strategies for mitigation.