Pea seedborne mosaic

Pea seedborne mosaic is a viral plant disease caused by the Pea seedborne mosaic virus (PSbMV), a member of the Potyviridae family. This pathogen is of significant economic concern globally, as it is efficiently transmitted through seeds, allowing it to move over long distances and persist in farming systems for many seasons.

The virus primarily affects leguminous species, most notably field pea (Pisum sativum) and lentil (Lens culinaris). By disrupting plant physiology, the infection compromises the health of these crops, leading to qualitative and quantitative losses in production that can be devastating for commercial seed growers.

Visible symptoms often include stunting, vein clearing, and characteristic mosaic mottling on leaves. In susceptible varieties, foliage may become distorted or curled. As the disease progresses, pods often display reduced development, and seeds may become shriveled or exhibit discoloration, which significantly lowers their market value and germination potential.

Transmission occurs through two main routes: vertical transmission via infected seeds and horizontal transmission via aphid vectors (such as Acyrthosiphon pisum). The non-persistent nature of the transmission means that aphids can acquire and transmit the virus within seconds of probing infected tissue, making rapid spread throughout a field highly likely.

Management strategies focus on rigorous seed health testing and the utilization of virus-free certified seed lots. Integrated pest management, including the monitoring and suppression of aphid populations, is essential during the early stages of crop growth. Additionally, planting resistant cultivars remains the most effective long-term solution for minimizing the impact of the disease.