Pea seed-borne mosaic virus

Pea seed-borne mosaic virus (PSbMV) is a significant plant pathogen belonging to the Potyvirus genus, family Potyviridae. It is a major virus affecting various legumes, primarily pea (Pisum sativum), causing systemic infections that severely impact crop health and agricultural productivity worldwide.

The virus manifests through symptoms such as leaf mosaic patterns, vein clearing, leaf rolling, and stunting of the entire plant. In severe cases, the infected plants produce deformed pods with fewer and smaller seeds, which directly reduces the market value and yield potential of the crop.

The life cycle of PSbMV is characterized by both seed transmission and insect vector transmission. The ability of the virus to reside within the seeds makes it highly mobile and difficult to eradicate. Once seedlings emerge, the virus is spread horizontally within the field primarily by aphid species, which transmit the pathogen in a non-persistent manner.

Development and spread are favored by environmental conditions that promote aphid activity, typically warm and relatively dry weather. The presence of reservoir weeds that host the virus during the off-season serves as a primary source of inoculum for subsequent growing seasons, complicating containment efforts in intensive farming areas.

Effective control strategies focus on integrated pest management (IPM) practices. Since there is no chemical cure for viral infections in the field, the emphasis is placed on prevention. Key measures include planting certified virus-free seeds, implementing strict aphid monitoring and control programs, and managing weed populations near fields to minimize virus reservoirs.