Lentinus tigrinus

Lentinus tigrinus is a wood-decaying fungus that primarily acts as a saprotroph but can function as a facultative parasite, attacking weakened or injured broad-leaved trees. In an agronomic context, it is categorized as a pathogen responsible for white rot, leading to the structural deterioration of wood tissues.

The causative agent of the disease is a basidiomycete fungus characterized by distinctive scaly caps that give it a "tiger-like" appearance. The mycelium penetrates the tree through wounds, pruning cuts, or frost cracks, where it secretes enzymes that decompose lignin and cellulose, effectively softening the wood and compromising its stability.

Typical symptoms include the development of white rot within the trunk or branches, where the wood turns soft, spongy, and fibrous. During the fruiting season, mushrooms emerge from the bark or damaged areas of the host plant. Trees frequently affected include various fruit trees, such as apple and pear, as well as amenity species like poplars and willows.

The development and spread of this fungus are highly dependent on environmental conditions, particularly high humidity and moderate temperatures during the growing season. Spores are primarily dispersed by wind or insects, landing on exposed wood surfaces. Fresh pruning wounds and untreated bark damages are the most common entry points for the fungal infection.

The economic impact of Lentinus tigrinus is significant, as it can cause branch dieback, tree decline, and eventual collapse of infected trees. Proactive measures include regular sanitary pruning, ensuring proper wound treatment with pruning sealants, and improving overall tree vitality through balanced fertilization and irrigation. Removing infected material promptly is essential to prevent the spread of spores to healthy trees.