Pea leafroll virus

Pea leafroll virus (formerly associated with members of the Polerovirus genus) is a significant plant pathogen that primarily affects legume crops globally. As a phloem-limited virus, it disrupts the movement of nutrients throughout the vascular system, leading to systemic physiological decline. The virus is unable to replicate in the plant without the support of the specialized environment provided by the sieve tube elements.

The primary host range includes economically important legumes such as field peas, broad beans, and various vetches. Additionally, the virus thrives in perennial legume weeds, which act as critical bridges for the pathogen between growing seasons. This ability to overwinter in non-crop vegetation makes the management of the virus extremely challenging for agronomists.

Symptoms of infection are usually distinct and noticeable during the vegetative stage. They include upward rolling of leaves, severe chlorosis, and general stunting of the plant. Infected pea plants exhibit reduced flowering and poor pod formation. Due to the compromised translocation of carbohydrates, the entire plant architecture becomes stunted, and the yield potential is often reduced to negligible levels.

Transmission occurs exclusively through aphid vectors, most notably the pea aphid (Acyrthosiphon pisum). The virus is acquired in a persistent, circulative manner. Once the aphid feeds on an infected plant, the virus circulates within the insect's body before being transmitted to a healthy plant. The efficiency of spread is directly correlated with the local population density of these aphid vectors.

• Monitor aphid populations using yellow sticky traps in the early season.
• Implement strict weed control to remove perennial reservoirs.
• Use systemic insecticides to manage vector outbreaks before spread occurs.
• Plant resistant cultivars where available to mitigate potential losses.
• Maintain spatial isolation from infested fields or forage legume crops.