Peziza

Peziza is a genus of cup fungi belonging to the Pezizaceae family. While the majority of species are saprotrophic, breaking down organic matter in the soil, some species can create hostile environments for seedlings and ornamental crops by competing for nutrients or forming dense mycelial mats that restrict soil aeration.

The causative agents are fungi of the order Pezizales. From an agronomic perspective, they are classified as soil-borne organisms that thrive in environments with high moisture levels and an abundance of undecomposed organic matter within the substrate, which is a common occurrence in greenhouses and nurseries.

The primary crops affected by the presence of Peziza include vegetable seedlings, container-grown flowers, and forest nursery stock. These fungi prefer substrates rich in peat and woody debris, especially when irrigation regimes are poorly managed and ventilation within the growing environment is inadequate.

Symptoms of infestation are marked by the emergence of characteristic cup-shaped or saucer-shaped fruiting bodies on the soil surface, typically brown or tan in color. The active mycelium can form a compacted layer or crust on the substrate surface, which interferes with water infiltration and can smother the root collar of young plants.

Control measures primarily focus on strict moisture management and ensuring sufficient airflow within greenhouse facilities. It is advised to use high-quality, sterilized growing media, prevent overwatering, and mechanically remove visible fruiting bodies before they release spores to limit the spread of the fungus.