Otidea

Otidea is a genus of cup-shaped fungi belonging to the Ascomycota division. In an agricultural and forestry context, while primarily saprotrophic, these fungi are monitored in nursery settings as they indicate specific soil conditions—such as high moisture and organic buildup—that can become detrimental to the growth of young seedlings.

The causative agent of fungal overgrowth is the mycelium of Otidea species. These organisms thrive as decomposers of forest litter, but their rapid proliferation in nursery soils can lead to competition for nutrients and physical obstruction of the soil surface, hindering proper root respiration for young forest crops.

These fungi mainly affect the topsoil layer, nursery beds, and the immediate root zones of saplings. They are particularly prevalent in shaded, damp environments with a high content of decomposing wood debris, where the lack of proper airflow facilitates the spread of the mycelial network.

Symptoms include the appearance of ear-shaped or cup-shaped fruiting bodies protruding from the ground. While the fungus itself is not a primary parasite, its presence often correlates with seedling stagnation, chlorosis, and increased susceptibility to secondary root-rot pathogens due to compromised soil conditions.

Protective and preventive measures include:

• Improving soil aeration through regular shallow cultivation.
• Reducing organic debris accumulation in the nursery beds.
• Managing humidity levels through controlled irrigation systems.
• Applying fungicides only if competitive pressure on seedlings is confirmed by pathology reports.