Coccochloris

The primary symptom is the appearance of a blue-green or dark green slimy layer covering the surface of the soil or growing substrate.

As the colonization advances, the slime hardens into a thick, crusty film that prevents water infiltration and soil aeration.

Plants affected by the surrounding presence of this algae often show signs of nutrient deficiency and slowed development.

Under severe pressure, the algae can creep onto the base of the stems, creating an environment favorable for secondary rot pathogens.

The substrate may emit a stagnant, musty odor, indicating that the surface crust has sealed off the underlying soil from necessary oxygen exchange.

Coccochloris is a genus of blue-green algae (cyanobacteria) that can proliferate in specialized agricultural environments, primarily greenhouses and nurseries.

These organisms are photosynthetic and thrive on moist surfaces, forming dense mats that can alter the chemical and physical properties of the growing medium.

Although they do not infect plants directly as parasites, their massive presence can be considered a sign of poor environmental management.

The reproduction is rapid, spreading through water irrigation systems, contaminated tools, or moisture droplets suspended in the air.

Their biological resilience allows them to survive in harsh conditions, making them a recurring challenge for producers using hydroponics or peat-based mixes.

High humidity levels and stagnant water on the soil surface are the most significant factors promoting the rapid spread of Coccochloris.

Persistent lighting, especially in controlled greenhouse environments, provides the energy required for constant photosynthetic growth.

Excessive nutrient runoff, particularly phosphorus and nitrogen levels, acts as a primary fertilizer for the rapid development of these colonies.

Temperatures ranging from 20°C to 28°C create an optimal environment for the species to establish colonies on almost any wet surface.

Poor circulation of air inside the facility prevents the soil surface from drying out between watering cycles, keeping it in a state of permanent saturation.

The physical crust created by the algae seals the soil surface, leading to hypoxic (low oxygen) conditions for the plant's root system.

Cyanobacteria compete directly with horticultural crops for available moisture and essential minerals near the root zone.

The environment created by the algae facilitates the colonization of more dangerous fungal and bacterial pathogens, leading to root rot.

Reduction in gas exchange causes physiological stress to the plants, resulting in stunted growth and significant yield losses.

The accumulation of waste products from the algae can alter the local pH of the substrate, further harming the plant's ability to absorb nutrients.

Effective management focuses on improving greenhouse environmental conditions to ensure the surface of the soil dries out between irrigations.

Regular mechanical disturbance, such as cultivating or scratching the soil surface, breaks the continuity of the algal mats and improves aeration.

Using inert top-dressing materials like perlite or fine gravel can shade the soil surface, inhibiting the photosynthesis required for algae growth.

Implementing proper drainage and cleaning of irrigation lines reduces the spread of algae spores throughout the greenhouse production area.

• Improve ventilation and air circulation
• Cultivate the topsoil frequently
• Apply inert mulch
• Sanitize tools and irrigation equipment
• Manage fertilizer runoff