Melaspileaceae fungi

Melaspileaceae is a family of fungi belonging to the order Arthoniales. In agronomy, these organisms are often observed colonizing tree bark. While many species are known as lichenized fungi, their presence on high-value horticultural or orchard crops can indicate a decline in tree health and contribute to the degradation of bark integrity.

The causal agent is the fungal mycelium that develops on the surface and within the outer layers of the plant's bark. This type of infestation is often associated with the breakdown of the periderm, providing an entry point for secondary pathogens. The biological impact is characterized by the interference with the tree's gas exchange and moisture regulation.

The host range includes various deciduous and coniferous trees, with particular susceptibility noted in aging orchards. Environments characterized by high humidity, poor air circulation, and long periods of leaf wetness are the primary drivers for the development and spread of these fungal colonies.

Diagnostic symptoms involve the emergence of small, carbonaceous, linear or disk-shaped structures known as apothecia scattered across the bark. Over time, the affected area may show signs of premature aging, flaking, and discoloration, which significantly stresses the tree's physiological systems.

Management and prevention of Melaspileaceae in an agricultural setting require a proactive approach focused on tree hygiene:

• Regular mechanical cleaning of the bark to remove dead tissue and lichen cover.
• Pruning procedures to improve light penetration and air movement within the canopy.
• Application of protective coatings or fungicides during dormant stages.
• Monitoring overall orchard health to prevent stress that makes trees more susceptible to bark colonization.