Plum fabavirus

Fabavirus pruni is a viral plant pathogen belonging to the genus Fabavirus, family Secoviridae. As an RNA-based virus, it causes systemic infection in host plants, interfering with cellular functions and leading to progressive deterioration of the plant's health over time.

The primary hosts for this virus are species within the Prunus genus. This includes commercially significant crops such as plums, apricots, peaches, and sweet cherries. Ornamental trees belonging to the same family can also serve as hosts, often acting as hidden reservoirs for the infection within an orchard or landscape setting.

Symptoms of the disease vary depending on the host species and environmental conditions. Common indicators include yellow mosaic patterns on leaves, chlorotic rings, stunted growth, and leaf deformation. Fruit development may be significantly impaired, showing irregular shapes, size reduction, and surface lesions that decrease their market value.

Transmission of the virus occurs primarily through vegetative propagation using infected scions or rootstocks. Additionally, insect vectors, specifically aphids, play a crucial role in the horizontal spread of the disease within an orchard. Mechanical transmission via contaminated pruning tools also poses a high risk if strict hygiene protocols are not followed.

Management of Fabavirus pruni is strictly preventative, as there is no cure for systemic viral infections in fruit trees once established. Farmers must prioritize the use of certified virus-free nursery stock. Integrated pest management, focusing on aphid control, and rigorous sanitation practices in the orchard are the most effective ways to mitigate the spread of this pathogen.

• Ensure all nursery stock is certified virus-indexed.
• Implement strict sanitation for pruning tools using alcohol or bleach solutions.
• Monitor and control aphid populations consistently throughout the growing season.