Cephalotrichum cylindricum

The most visible symptom of Cephalotrichum cylindricum infection is the appearance of gray-to-black sooty or olive-colored mold on seeds and plant tissues.

In seeds, the infection manifests as a coating of fungal growth that severely reduces germination energy and leads to seedling blight or complete mortality.

On vegetative parts, the fungus causes necrotizing spots that gradually expand, damaging the leaf surface and affecting the plant's ability to thrive.

• Sooty black mold growth on surfaces.
• Reduced germination and vigor.
• Irregular necrotic lesions on stems and leaves.
• Damping-off of young seedlings.

During periods of high moisture, the infected areas become covered in a dusty layer of conidia, which is a classic sign of the fungus reaching its sporulation stage.

Cephalotrichum cylindricum (formerly known as Doratomyces cylindricus) is a fungal pathogen belonging to the group of imperfect fungi, often found as a saprophyte on organic debris.

The biology of this fungus is characterized by the production of synnemata-like conidiophores, which facilitate the efficient release and dispersal of spores in the environment.

It is known for its ability to survive in the soil and on crop residues, making it a persistent inhabitant of agricultural ecosystems across temperate regions.

The fungus is primarily spread through airborne spores, water splashing, and physical contact with contaminated equipment or seed lots.

Its mycelial growth is highly adaptive, allowing it to colonize both healthy and stressed plant tissues, especially when competition from other microorganisms is low.

The development of the fungus is favored by high relative humidity (above 85%) and moderate ambient temperatures ranging from 20°C to 25°C.

Poor aeration in crop stands, dense planting, and shading create an ideal microclimate for the rapid establishment of the pathogen.

Storage facilities with inadequate climate control, where moisture accumulates, are prime locations for the rapid spread of this mold on harvested commodities.

Mechanical damage to plant tissue, whether from insect feeding or improper handling, provides the pathogen with easy entry points to colonize the plant.

The presence of abundant decaying organic matter on the soil surface acts as a primary inoculum source for subsequent growing seasons.

The primary economic impact of this pathogen is the degradation of seed quality, which leads to poor stand establishment and decreased total yield.

Fungal metabolites produced during colonization can be phytotoxic, causing the wilting and eventual death of young, vulnerable plants.

Contamination of post-harvest products not only causes direct weight and quality loss but also limits the marketability of the affected grain or vegetable batches.

The physiological stress caused by the infection reduces the overall photosynthetic capacity of the plant, negatively impacting grain filling and fruit development.

Control measures and losses due to post-harvest decay represent a significant financial burden for producers and storage facility operators.

Effective management begins with strict control of grain moisture content during harvest and throughout the storage period to prevent mold growth.

Seed treatments using broad-spectrum fungicides are essential to protect germinating seeds from soil-borne and seed-borne inoculum.

Field sanitation, including the deep incorporation of crop residues, helps reduce the amount of inoculum available for the next planting cycle.

Optimizing crop density and managing weeds helps improve airflow and light penetration, reducing the humidity around the plants.

In controlled environments like greenhouses, maintaining proper ventilation and avoiding water accumulation on leaves are critical to suppressing the development of the fungus.