Steccherinum fimbriatum

Steccherinum fimbriatum is a species of crust fungus in the family Steccherinaceae. Within the field of agronomy and forest pathology, it is recognized as a fungus that colonizes decaying or stressed woody plants, acting primarily as a decomposer that contributes to white rot in various hardwood species.

The host range of this fungus is quite broad, including many deciduous trees such as apple, birch, oak, and beech. It typically invades trees that are already weakened by environmental stress, mechanical injuries, or other biological pathogens, focusing on the dead and dying woody tissues of the plant.

The primary symptom of infection is the presence of small, thin, resupinate (crust-like) fruit bodies on the surface of branches or bark. These structures are easily identified by their yellowish-cream color, the presence of small downward-pointing spines (teeth), and distinctly fringed or fimbriate margins.

The development of Steccherinum fimbriatum is highly dependent on environmental moisture and temperature. Spores are released into the air and travel through wind or water splashes, germinating on wounded bark or exposed wood, where they initiate the colonization process that degrades the wood structure.

The economic impact of this fungus is significant in orchards and managed forests, as it compromises the structural integrity of trees. To prevent and manage the damage, agricultural professionals recommend the following actions:

• performing regular sanitary pruning of dead or diseased branches;
• sealing pruning wounds with protective fungicides or sealants;
• maintaining optimal tree vigor through proper irrigation and fertilization;
• avoiding mechanical damage to the bark during cultivation operations.