Apricot ringspot

Apricot ringspot is a viral plant disease caused by the Prunus necrotic ringspot virus (PNRSV). This pathogen is widespread globally and belongs to the genus Ilarvirus, causing systemic infection in various stone fruit species, often leading to significant economic losses in commercial horticulture.

The disease primarily impacts stone fruit trees, including apricot, peach, plum, sweet cherry, and sour cherry. The virus affects the physiological processes of the tree, hindering fruit development and reducing the overall vigor of the host plant, which makes it particularly dangerous for nursery production.

Symptoms typically appear in the spring and manifest as chlorotic spots, rings, and line patterns on the leaves. As the season progresses, necrosis may occur, causing leaf deformation and premature defoliation. In some instances, the virus causes irregular fruit ripening and structural deformities in the fruit flesh, rendering the crop unmarketable.

Transmission occurs primarily through infected propagation materials, such as grafts, buds, and rootstocks. Pollen transmission is another critical factor in the spread of PNRSV, as the virus can be carried from infected to healthy trees by bees or wind. Additionally, contaminated pruning equipment can serve as a vector if not sanitized properly between trees.

• Strictly use virus-indexed, certified nursery stock for all new plantings.
• Sanitize all pruning and grafting tools using alcohol or bleach solutions.
• Rogue and remove infected trees immediately to minimize the spread of the virus.
• Monitor the orchard for symptoms during the early stages of the growing season.
• Avoid establishing new orchards in close proximity to heavily infected old groves.