Plum mosaic virus

Cheravirus pruni is a plant pathogen classified within the genus Cheravirus. It is responsible for causing mosaic-like symptoms in stone fruit trees, significantly impacting the health and agricultural productivity of commercial and private orchards.

The primary hosts of this virus include various species of Prunus, most notably plums, damsons, and occasionally sweet cherries. The virus invades the vascular system of the tree, causing systemic infection that persists throughout the entire lifespan of the host plant.

Symptoms of the infection typically manifest as chlorotic mottling, mosaic patterns, or yellow ring-spots on the leaves. In severe cases, the foliage may become deformed or curled, and the tree may show signs of stunted growth, leading to reduced photosynthesis and overall decline in vigor.

Transmission occurs primarily through human activity, including the use of infected grafting scion wood or rootstocks. Mechanical transmission via contaminated pruning equipment is also a major vector, as the virus can be easily transferred from infected sap to healthy tissue during standard horticultural maintenance.

• Utilize only certified virus-free planting material from reputable nurseries.
• Sanitize pruning shears and saws using disinfectants between each tree.
• Implement strict vector control, including management of soil-borne nematodes.
• Rogue out and destroy infected trees to prevent the spread to adjacent healthy specimens.
• Maintain general orchard hygiene by removing weeds that may harbor viral reservoirs.

The economic impact of Cheravirus pruni is substantial, as infected trees often become unproductive and eventually succumb to secondary stress factors. Since there are no chemical pesticides to cure the virus once it has colonized the tree, prevention through biosecurity remains the only effective strategy.