Tomentellopsis

Tomentellopsis is a genus of basidiomycetous fungi belonging to the family Thelephoraceae. Within the scope of agricultural and forestry pathology, this genus includes soil-borne fungi that can act as opportunistic pathogens, affecting the root systems of various plant species, particularly in nursery settings.

The disease is caused by fungal mycelium proliferating in the rhizosphere. It is classified as a root-rot type of infection, which targets the root epidermis, thereby impairing the plant's ability to absorb water and essential nutrients, leading to rapid decline in vigor.

The primary hosts of this pathogen include seedlings of conifers and certain woody ornamental species. The fungus is often found in the soil surrounding the roots, where it can form mats that create a physical and chemical barrier against healthy root functions.

Common symptoms of infection include:

• Chlorosis and wilting of needles or leaves.
• Visible white or brown mycelial mats on the soil surface or root collar.
• Necrosis and dieback of the fine root system.
• Stunting of growth and increased plant mortality rates in nurseries.

Environmental conditions conducive to the development of this pathogen include high soil moisture, poor drainage, and the presence of organic debris. Moderate temperatures, typically between 15°C and 22°C, combined with high humidity, significantly accelerate the spread and colonization of the mycelium.

Effective management strategies emphasize proactive nursery sanitation, the use of sterile growing media, and the promotion of good soil drainage to prevent moisture buildup. In cases of localized infection, chemical intervention with appropriate soil-applied fungicides or the application of biological control agents to outcompete the pathogen is recommended.