Meripilaceae fungi

The Meripilaceae family comprises several species of basidiomycete fungi recognized primarily as agents of white rot in woody plants. These fungi function as opportunistic pathogens that target the root systems and the lower trunks of mature trees. Their activity leads to a significant reduction in the mechanical stability of the host, posing risks to forest health and urban landscaping.

These pathogens typically infect a broad range of deciduous hosts, including species like beech, oak, and maple. The mycelium invades the wood tissue, decomposing lignin and cellulose, which creates structural fragility. In an agronomic and forestry context, the presence of these fungi indicates a breakdown in the natural defense mechanisms of the tree, often linked to age or stress.

Diagnostic symptoms are often hidden until the late stages of infection when large, fleshy fruiting bodies emerge at the base of the trunk or on major roots. Internally, the affected wood exhibits a white, bleached appearance with distinctive black zone lines. As the root system loses its integrity, trees often display signs of decline, such as yellowing foliage and stunted annual growth.

Favorable conditions for the development of Meripilaceae include poor soil drainage, high moisture levels, and pre-existing wounds on the root collar. The fungus can persist in the soil for several years, using rhizomorphs to spread to the root systems of healthy adjacent trees. Consequently, the disease often manifests in circular patterns or clusters within a stand.

• Strict removal of infected stumps and root systems.
• Improving soil aeration and drainage around high-value trees.
• Avoiding mechanical damage to tree roots during landscaping.
• Periodic monitoring for fruiting bodies during late summer.
• Using preventative fungicides on wounds when necessary.

The economic impact is primarily related to the loss of mature, aesthetic, or timber trees. Since there is no effective systemic treatment for established root rot, management strategies emphasize prevention and the mitigation of risks associated with falling trees. Maintaining tree vitality through proper fertilization and stress management remains the most effective deterrent against these wood-decaying organisms.