Coal-black false truffle

Elaphomyces anthracinus, commonly known as the coal-black false truffle, is an ascomycete fungus that acts as a specific mycorrhizal symbiont forming subterranean fruit bodies. In forestry and agroforestry, its presence is analyzed as a factor that influences root system development, sometimes competing for soil resources with young tree seedlings.

The agent, Elaphomyces anthracinus, belongs to the order Elaphomycetales. While its primary biological role is to establish mycorrhizal connections, excessive mycelial growth around roots can hinder the absorption of nutrients, particularly in forest nurseries, categorizing it as an undesirable soil inhabitant in certain cultivation contexts.

This fungus primarily affects the roots of various deciduous and coniferous trees, including oak, beech, and pine. The cultures suffer because dense mycelial mats, known as sclerotia, can mechanically compress fine feeder roots, effectively slowing the growth of young trees during their most vulnerable developmental stages.

Symptoms of its presence manifest as stunted growth in saplings and noticeable changes in the rhizosphere composition. Distinctive signs include spherical or slightly flattened fruit bodies covered with a dark, almost black, warted peridium, typically found within the leaf litter or the upper horizon of the soil.

• Regular monitoring of soil microflora composition.
• Adherence to crop rotation principles in forest nurseries.
• Optimization of soil acidity and moisture to decrease fungal activity.
• Removal of contaminated litter layers during soil preparation for planting.
• Application of fungicides in cases of high population density in nursery settings.

Control measures focus on improving growing conditions to ensure that trees can successfully compete for nutrition. Prevention relies on proper substrate preparation and the use of acclimatized, healthy planting material, which reduces the risk of negative impacts from mycorrhizal fungi competing for root system resources.