Lentil yellows

Lentil yellows is a viral disease primarily caused by the Bean leaf roll virus (BLRV), a member of the Luteoviridae family. This virus affects the phloem of the plant, causing physiological disruptions that inhibit the movement of photoassimilates from leaves to reproductive organs and roots.

The disease affects various pulse crops, most notably lentils and peas. It is particularly dangerous because the virus can persist in perennial legumes and various weed species, which serve as green bridges, ensuring the virus is available to infect new crop rotations every season.

Visible symptoms often include severe yellowing of the younger leaves at the top of the plant canopy. As the infection progresses, affected lentils display stunted growth, shorter internodes, and a reduced number of pods. In severe cases, the entire plant may appear chlorotic and exhibit signs of early senescence.

Transmission occurs exclusively through aphid vectors, such as the pea aphid or other species, which acquire the virus while feeding on infected sap. The spread of the disease is highly dependent on aphid population dynamics; warm, dry conditions generally increase insect activity, leading to wider field dispersal of the virus.

The economic impact of Lentil yellows is severe, as it causes a significant reduction in seed yield and overall crop quality. Control strategies focus on managing the vector population through timely insecticide applications, maintaining strict weed control to remove host reservoirs, and using certified, disease-free seed when possible.