Artist's bracket

Artist's bracket (Ganoderma applanatum) is a prominent wood-decay fungus that causes white heart rot in a wide variety of deciduous trees. As a hemibiotroph, it first infects the heartwood and eventually invades the sapwood. It is a cosmopolitan species, frequently found in forests, parks, and urban orchards, acting as both a parasite and a decomposer of dead wood.

The fungus primarily attacks hardwood species including oak, beech, birch, poplar, and various fruit-bearing trees. It enters the host through wounds, broken branches, or root damage. Once established inside the tree, the mycelium continues to grow for years, eventually producing large, perennial woody fruiting bodies on the trunk surface.

Visible symptoms include the presence of shelf-like fungal conks that can grow to significant sizes. The internal wood undergoes extensive degradation, showing a characteristic white, bleached, and spongy texture with distinct black zone lines. As the decay progresses, the structural integrity of the tree is severely compromised, often making the tree hollow and unstable.

• Infection through pruning wounds or environmental damage.
• High humidity and shaded areas.
• Poor tree vitality and advanced age.
• Presence of existing decay in the root zone.

The damage caused by Ganoderma applanatum is primarily structural and physiological. Trees infected with this pathogen become high-risk specimens due to their increased susceptibility to windthrow or trunk failure. From a horticultural perspective, it leads to stunted growth, reduced fruit production, and the eventual death of the host tree if left unmanaged.

Management strategies focus on tree hygiene and environmental control. It is crucial to prevent wounding, properly seal large pruning cuts, and ensure that trees are kept in vigorous health through adequate fertilization and irrigation. Infected trees with extensive internal decay should be evaluated by specialists and removed if they pose a safety hazard to people or property.