Ceratobasidium cornigerum

Ceratobasidium cornigerum is a basidiomycetous soil-borne fungus responsible for various diseases in plants, including root rot, damping-off, and stem lesions. It functions as both a necrotrophic pathogen and a saprophyte, allowing it to survive efficiently in soil debris when host plants are not available.

This pathogen exhibits a broad host range, affecting a wide variety of species such as cereals, legumes, various vegetables, and turfgrasses. Its impact is most significant on seedlings and young plants, where it disrupts the development of the root system and reduces the overall stand density in fields.

Symptoms of infection are often manifested as browning and decay of the roots and stem base. Infected seedlings may collapse, displaying dark necrotic lesions. In humid conditions, a fine, often white or translucent mycelium may appear on the affected tissues, which is a diagnostic sign of active fungal growth.

The development and spread of Ceratobasidium cornigerum are heavily influenced by environmental conditions, particularly high soil moisture and poor drainage. The pathogen thrives in cool to moderate temperatures, often leading to significant damage during damp spring conditions when plant development is slow and vulnerable.

Effective management requires a multi-faceted approach, emphasizing good agricultural practices like soil aeration and drainage improvement to limit moisture-heavy conditions. Additionally, seed treatment with broad-spectrum fungicides, proper crop rotation schedules, and the removal of infected plant residues are essential to reduce the inoculum pressure in the soil.