Tomentella caerulea

The fungus forms a thin, spreading mycelium on the substrate, which may have a characteristic bluish or greyish tint. Reproductive organs (basidiomata) develop directly on the surface of decayed plant residues or soil.

The biology of this species is closely linked to the decomposition of organic matter, but under certain conditions, it can colonize the root systems of weakened woody and herbaceous plants.

The microscopic structure of the fungus is distinguished by the presence of specific hyphae with clamps, which is an important diagnostic feature for mycologists.

In an agronomic sense, this species rarely acts as an aggressive parasite; it is more often encountered as an indicator of waterlogged soils with a high content of undecomposed woody organic matter.

The main sign of Tomentella caerulea presence is the appearance of a bluish or greyish-blue coating on the root collar or roots of plants.

In the initial stages of infection, plant tissues may darken slightly, acquiring a brownish tint, which is often confused with ordinary rotting due to excess moisture.

With careful examination using a magnifying glass, one can notice thin strands of mycelium that tightly wrap around the root, hindering the absorption of water and minerals.

Externally, the plant begins to look suppressed, its growth slows down, and leaves may turn chlorotic due to the impaired function of the root system.

In advanced cases, the affected parts of the root bark peel off, and underneath, the tissue reveals the characteristic fungal coating, indicating deep penetration of the pathogen into the bark.

The development of Tomentella caerulea depends directly on soil moisture levels; the pathogen prefers constantly damp, poorly aerated environments.

Optimal conditions for the fungus spread are created in shaded areas where the soil does not dry out for a long time, as well as in conditions of stagnant meltwater or rainwater.

The presence of large amounts of plant residues, especially wood chips, bark, or uncomposted organic matter, contributes to the rapid reproduction of this fungus mycelium.

An acidic soil reaction favors the activity of this species, so the risk of plant colonization is higher in acidic soils.

A moderate temperature range (from +15 to +22 degrees Celsius) is the most comfortable for the intensive growth of tomentella colonies.

The main damage consists of disrupting the normal functioning of the root system, which leads to a decrease in the overall viability of the crop.

Affected plants experience nutritional deficits because the mycelium creates a mechanical barrier to the absorption of essential elements by root hairs.

In industrial cultivation conditions, this can lead to sparse crop density and a reduction in total yield, especially in nurseries and greenhouses.

A secondary factor of harmfulness is that tissues damaged by the fungus become "entry gates" for more dangerous pathogens that cause Fusarium or Rhizoctonia.

Plants weakened by tomentella cope worse with stress factors such as drought or sudden temperature drops, which often leads to the death of the specimen.

The main preventive method is improving soil drainage to prevent water stagnation, as this fungus does not tolerate good aeration.

Regular liming of soils is recommended if acidity is high, as this creates unfavorable conditions for the development of the basidiomycete.

An important practice is the timely removal and disposal of plant residues that serve as a substrate for the accumulation of infection.

In case of massive infection of seedlings, systemic fungicides approved for combating soil-borne fungal infections (copper-based preparations or broad-spectrum fungicides) should be used.

• Optimization of the watering regime;
• Application of deoxidizers (lime);
• Clearing the area of woody debris;
• Observance of crop rotation;
• Use of healthy planting material.