Elaphomycetales

Elaphomycetales are an order of ascomycetous fungi that live exclusively underground. While they are often studied in the context of forest pathology, they are not typically classified as plant diseases but rather as essential mycorrhizal partners for various tree species, especially conifers and some hardwoods.

The fungi primarily interact with the root systems of forest trees, creating an ectomycorrhizal network. This symbiotic relationship is crucial for the tree's uptake of water and essential mineral nutrients, such as phosphorus and nitrogen, in exchange for photosynthetically derived carbohydrates provided by the host plant.

Symptoms of colonization by these fungi do not resemble standard plant diseases. There is no leaf chlorosis, stem rot, or root decay. Instead, the fungal presence is characterized by the formation of subterranean fruit bodies, commonly known as deer truffles, which thrive beneath the forest floor layer.

Development and spread are dictated by soil health and forest maturity. These fungi thrive in acidic, undisturbed soils with high organic matter content. Disruptions in the soil structure, such as deep tilling or heavy compaction, often inhibit the growth of these beneficial fungal networks, leading to a decrease in their population.

In terms of forest management, Elaphomycetales are viewed as beneficial assets rather than threats. No control measures are needed because they do not cause economic damage to crops. In fact, forestry practitioners often aim to preserve these mycorrhizal networks, as they enhance the overall resilience and growth rate of young saplings in nursery and reforested areas.