Tomentella bryophila

Tomentella bryophila is a basidiomycete fungus within the Thelephoraceae family that acts as a soil-borne plant pathogen. It is recognized in agronomy for its ability to colonize the root systems and stem bases of various crops, particularly in environments with high humidity and poor air circulation.

This pathogen primarily targets greenhouse-grown vegetables, ornamental plants, and young seedlings in nurseries. It thrives in moist substrates where organic matter is abundant, making it a significant concern for controlled-environment agriculture where moisture levels are consistently high.

Symptoms of an infection typically manifest as a brown or olive-colored mycelial mat covering the soil surface around the base of the plant. Infected plants exhibit chlorosis, stunted growth, and eventual wilting as the fungus damages the root cortex, restricting water and nutrient uptake.

The spread and development of the disease are heavily influenced by environmental factors such as excessive irrigation, high relative humidity, and lack of soil aeration. The fungus disseminates through spores and mycelial fragments, often transmitted via contaminated irrigation water or infected potting soil.

Effective management requires a combination of cultural and biological practices. Maintaining proper drainage and reducing surface moisture are critical to preventing outbreaks. Growers should focus on sanitation, using sterilized growing media and biocontrol agents, such as Trichoderma species, which compete with the pathogen for resources and inhibit its growth.