Rosellinia subiculata

Rosellinia subiculata is a fungus belonging to the order Xylariales, within the family Xylariaceae. It is widely recognized as a saprotrophic fungus that thrives on decaying wood, though it can transition to a weak parasitic lifestyle when host plants are stressed by unfavorable environmental conditions.

The fungus is associated with various forms of wood decay and root infections in forest ecosystems. It primarily colonizes broad-leaved trees, breaking down lignin and cellulose. While it is a key component of natural decomposition processes, its presence in managed forest nurseries can lead to mortality among young seedlings.

Its biological cycle is characterized by the formation of distinctive bright, orange-brown subiculum (a felt-like mat of hyphae) that supports the development of perithecia. The fungus reproduces through ascospores, which are dispersed by wind currents. Under optimal conditions, the mycelium can spread rapidly through the soil, infecting neighboring roots through direct contact.

The development of Rosellinia subiculata is heavily influenced by high moisture levels and poor aeration in the soil. It is commonly found in shaded, humid environments where forest litter or deadwood remains undisturbed, providing a constant source of nutrients for the fungal colony to persist throughout the year.

Effective control measures focus on integrated forest management practices to reduce the availability of substrates for the fungus. Key strategies include:

• sanitary removal of fallen wood and infected tree debris;
• improving soil drainage in nurseries to prevent waterlogging;
• monitoring the health of the root collar in young saplings during periods of high humidity.