Basidioradulum radula

Basidioradulum radula is a wood-decaying fungus belonging to the Basidiomycota phylum. It acts as a pathogen causing white rot, primarily targeting deciduous trees. This fungus is known for its ability to decompose the woody tissue of trees, gradually leading to structural instability and the eventual decline of the host plant.

The fungus typically infects various fruit trees, including apple, pear, and cherry, as well as several hardwood species found in forests. It gains entry into the tree through wounds in the bark, frost cracks, pruning cuts, or areas damaged by pests, exploiting exposed woody surfaces to establish its mycelial network.

The primary clinical signs of infestation involve the appearance of characteristic fruiting bodies on the surface of the trunk or branches. These bodies are often flat or reflexed, displaying a distinct texture covered in small teeth or bumps, hence the name. Internally, the wood becomes soft, fibrous, and discolored, indicating that the fungus is actively breaking down the structural integrity of the plant.

Development and spread of the pathogen are highly favored by high humidity, prolonged rainy weather, and mild temperatures. Spores are disseminated by wind, rain, or insects, allowing the fungus to spread throughout an orchard or forest patch. Once established in a host, the mycelium continues to grow as long as conditions remain favorable, often persisting throughout the dormant season.

The impact of this disease on agricultural productivity is significant, as it weakens the tree's vascular system and can cause branches or trunks to collapse. Prevention and management strategies include:

• Implementing strict orchard sanitation by removing and burning infected deadwood.
• Sealing large pruning wounds with protective fungicides or pruning paints to prevent fungal entry.
• Maintaining tree vigor through proper fertilization and pest control to boost natural resistance.
• Removing severely compromised trees and their stumps to prevent the fungus from spreading to healthy neighbors.