Split gill fungus

Systematic position: Schizophyllum commune, commonly known as the split gill fungus, belongs to the kingdom Fungi, phylum Basidiomycota, and the genus Schizophyllum. It is a cosmopolitan basidiomycete fungus that primarily functions as a wood-decaying saprotroph but can act as a facultative parasite in weakened trees.

Affected crops and diseases: The fungus affects a wide variety of deciduous trees, including fruit species like apple, pear, and plum, as well as various ornamental trees. It is the causal agent of white rot, which deteriorates wood tissues, leading to structural instability and internal degradation of the woody parts of the plant.

Biology and life cycle: The lifecycle of Schizophyllum commune involves the formation of fan-shaped fruiting bodies with unique split gills. The fungus produces basidiospores that are dispersed by wind. A notable feature of this species is its exceptional desiccation tolerance; it can enter a dormant state during dry conditions and resume growth immediately upon rehydration.

Conditions and pathogenicity: The fungus typically enters through wounds, such as pruning cuts, frost cracks, or insect damage. High humidity and poor air circulation within the tree canopy favor infection. Pathogenicity is realized through the enzymatic breakdown of cellulose and lignin, leading to rapid decay of the tree's vascular and support tissues, ultimately causing branch dieback and limb failure.

Control and management: Effective management relies on proactive horticultural practices to keep trees healthy and minimize infection sites. Key strategies include:

• Proper pruning techniques to facilitate quick healing of wounds.
• Application of antifungal sealants to large pruning cuts.
• Timely removal and destruction of infected wood to prevent spore spread.
• Maintaining tree vigor through balanced fertilization and appropriate irrigation to reduce susceptibility to colonization.