Chili veinal mottle virus

Chili veinal mottle virus (ChiVMV) is a significant plant pathogen belonging to the Potyvirus genus. It is responsible for severe mosaic and mottling symptoms in pepper crops, leading to significant economic losses for growers worldwide by reducing both the quality and the total yield of the produce.

The virus primarily affects chili peppers (Chili spp.) and sweet peppers (Sweet Pepper). Besides these main hosts, the virus can also infect other members of the Solanaceae family and various weeds that act as reservoir hosts, maintaining the viral presence in the environment even when primary crops are not being cultivated.

The characteristic symptoms of ChiVMV infection include clear chlorotic veinal mottling, interveinal mosaic patterns, and dark green islands on the leaf surface. As the infection progresses, leaves may become distorted, crinkled, and reduced in size. Affected plants exhibit stunted growth, and the fruit often displays surface mottling, ring spots, or significant size reduction.

The primary mode of transmission is through aphid vectors, such as the green peach aphid (Myzus persicae). The virus is transmitted in a non-persistent manner, meaning that aphids can acquire and transmit the pathogen within seconds of probing an infected plant, making rapid spread throughout a field highly probable if vector populations are not managed.

Effective management strategies focus on preventing the introduction and spread of the virus. Key measures include using virus-free seeds or healthy transplants, implementing rigorous weed control to eliminate reservoir hosts, and applying systemic insecticides to control aphid populations. Additionally, applying reflective mulches can help deter aphids, and removing infected plants helps to reduce the inoculum load in the field.