Melogramma spiniferum

Melogramma spiniferum is a fungal pathogen responsible for specific bark-related diseases in woody plants. As a member of the Ascomycota division, this fungus primarily acts as a parasite or saprotroph, colonizing the bark layers and cambium of weakened host trees.

The disease is most commonly found affecting deciduous trees, particularly species within the Fagus and Carpinus genera. It is typically observed in managed forest stands and park environments where mature trees may experience stress due to environmental factors, providing an entry point for the fungus.

The primary symptom of infection is the development of fungal stromata beneath the periderm. As the fungus matures, these structures push through the outer bark, creating distinct, spine-like protrusions or rough, dark crusts. These structural changes effectively compromise the integrity of the bark layer.

Environmental conditions play a critical role in the proliferation of Melogramma spiniferum. High humidity levels, combined with cool weather, favor the dispersal of spores. The pathogen typically gains entry into a host through wounds caused by pruning, mechanical damage, or winter injury, which serve as primary infection courts.

The impact of this disease on tree health can be significant. By disrupting the bark's vital functions and damaging the phloem, the fungus hinders the tree's ability to transport nutrients. Over time, heavy infestation leads to branch dieback, crown thinning, and can ultimately contribute to the mortality of the affected plant if left unmanaged.

• Conducting regular sanitation pruning to remove infected wood.
• Disinfecting pruning tools to prevent cross-contamination.
• Applying antiseptic treatments to wounds or cuts on the bark.
• Maintaining optimal tree vitality through proper fertilization and irrigation.
• Monitoring vulnerable stands for early signs of fungal bark colonization.