Tomentella sublilacina

Tomentella sublilacina is a species of basidiomycete fungus within the Thelephoraceae family. In agricultural and forestry contexts, this fungus is often identified as a soil-borne organism that can occasionally act as a pathogen, contributing to root decay and the decline of plant vigor in nurseries and specialized plantations.

The pathogen belongs to the group of corticioid fungi, characterized by the formation of thin, crust-like fruiting bodies on moist surfaces. The type of disease it causes is generally associated with root rot or collar decay, which disrupts the vascular system and prevents efficient water and nutrient uptake from the soil matrix.

The primary hosts of this pathogen include various forest tree species and ornamental shrubs. It thrives in environments where soil organic matter is abundant and moisture levels remain consistently high, creating an ideal microclimate for fungal colonization of both decomposing material and living root tissues.

Symptoms of the infection typically manifest as a subtle, lilac-colored fungal mat on the roots or the base of the stem. As the disease progresses, the root cortex becomes necrotic, leading to leaf yellowing, overall stunted growth, and in severe cases, the death of the seedling or young tree due to compromised root integrity.

• Excessive soil moisture and poor drainage
• Presence of woody debris or uncomposted organic matter
• High humidity levels in the root zone
• Soil compaction limiting root development

Protective measures focus on improving soil aeration and moisture management to prevent favorable conditions for the fungus. Preventive strategies include the application of biological control agents that compete with the pathogen, ensuring proper drainage in nurseries, and avoiding the use of raw, non-decomposed organic fertilizers that can trigger fungal outbreaks.