Pepper mottle virus

Pepper mottle virus (PepMoV) is a significant viral pathogen belonging to the Potyvirus genus, which causes systemic infection in various agricultural crops. The virus primarily affects solanaceous plants, most notably sweet peppers, and has also been identified as a pathogen affecting soybean crops, leading to significant yield losses.

The primary mode of transmission is through aphid vectors (such as Myzus persicae) in a non-persistent manner. This means the virus can be acquired and transmitted by the insect within seconds of feeding. Mechanical transmission through contaminated tools, equipment, or handling of plants also plays a role in the spread of the pathogen within greenhouses and open fields.

The symptoms of Pepper mottle virus include a characteristic mosaic pattern on leaves, manifesting as light green or yellow spots and mottle. Infected plants often exhibit stunted growth, leaf curling, and distortion. Fruits produced by diseased plants are frequently malformed, discolored, or reduced in size, significantly lowering the market value of the harvest.

Development and spread of the virus are highly dependent on environmental conditions that favor aphid population growth. Warm temperatures increase the activity and migration of vectors, facilitating the rapid movement of the virus from reservoir weeds to cultivated crops. The presence of secondary host plants near the field acts as a continuous source of inoculum.

Control strategies for Pepper mottle virus focus on integrated pest management (IPM) practices. Key measures include:

• Rigorous aphid population control using selective insecticides.
• Removal of weed hosts and reservoir plants in the vicinity.
• Utilization of certified, virus-free seeds and seedlings.
• Sanitation protocols for farming tools to prevent mechanical transmission.
• Prompt roguing (removal) of symptomatic plants to limit the spread of the pathogen.