Pepper mottle virus

Pepper mottle virus (PepMoV) is a destructive plant pathogen belonging to the genus Potyvirus within the Potyviridae family. It primarily affects plants in the Solanaceae family, posing a significant threat to commercial pepper, tomato, and tobacco production worldwide.

The virus causes distinctive symptoms including leaf mottling, mosaic patterns, vein clearing, and severe leaf deformation. Infected plants often show stunted growth and produce reduced yields of low-quality, misshapen fruit, which significantly diminishes the economic value of the harvest.

Biologically, PepMoV is transmitted in a non-persistent, stylet-borne manner by various aphid species, most notably the green peach aphid (Myzus persicae). The virus is acquired rapidly during brief feeding probes by the vector and can be immediately transmitted to healthy plants, allowing for quick spread throughout a field.

Environmental conditions that favor aphid population outbreaks, such as moderate to warm temperatures, drastically increase the spread of the virus. Weeds within the Solanaceae family act as overwintering reservoirs, ensuring that the pathogen persists in the environment even when no commercial crops are present.

Management and control strategies focus on integrated pest management (IPM) practices, including the use of aphid-resistant or virus-tolerant cultivars. Effective control also involves removing reservoir weed hosts, applying insecticides to manage vector populations, and implementing strict sanitation protocols to prevent mechanical transmission via equipment and worker handling.

• Monitor aphid populations regularly.
• Control Solanaceous weed hosts in and around fields.
• Use certified virus-free planting materials.
• Implement proper field hygiene to prevent mechanical spread.