Mattirolomyces

Mattirolomyces is a genus of fungi within the family Terfeziaceae. In the context of commercial truffle farming, Mattirolomyces is recognized not as a direct plant pathogen, but as an aggressive competitor that can cause significant economic losses by displacing the desired truffle mycelium in the rhizosphere of host trees.

The primary agent of concern is Mattirolomyces terfezioides. This soil-borne ascomycete fungus is highly adapted to the same environments as cultivated truffles. It spreads through the soil and rapidly colonizes roots, preventing the establishment of the symbiotic mycorrhiza required for truffle production, effectively hijacking the host plant's energy resources.

The main crops affected are artificial truffle plantations, particularly those targeting Tuber species. Mattirolomyces is opportunistic and thrives in soils that may have been poorly prepared or where the native microbial balance has been disrupted. It does not kill the trees but renders the orchard commercially unproductive.

Symptoms are largely subterranean and often go unnoticed until the harvest season. Growers typically identify the problem by the absence of expected truffle yields and the subsequent appearance of Mattirolomyces fruiting bodies, which appear in the soil near the roots of the host trees. These fruiting bodies are visually distinct and lack the culinary market value of true truffles.

Prevention and management are critical because there are no effective fungicides to eliminate this fungus once it is established in an orchard. Recommended practices include:

• Rigorous soil testing for the presence of Mattirolomyces spores before planting.
• Using only certified, guaranteed truffle-inoculated seedlings.
• Maintaining strict sanitation protocols for all equipment to prevent cross-contamination between plots.