Trichoderma atroviride

Trichoderma atroviride is a group of beneficial soil fungi highly valued for their antagonistic properties against various plant pathogens. The primary mechanism involves mycoparasitism, where the fungus actively identifies, attacks, and degrades the cell walls of pathogenic organisms using specialized enzymes.

The fungus effectively competes for nutrients and space within the rhizosphere, acting as a biological shield for plant roots. By quickly colonizing the root zone, it physically prevents pathogenic fungi and bacteria from accessing the plant tissue, thereby reducing disease pressure.

Furthermore, this organism is known for its ability to induce systemic resistance in host plants. By secreting specific metabolites, it stimulates the plant's immune system, strengthening its natural defenses against diverse biotic and abiotic stresses.

The fungus contributes to soil fertility by accelerating the decomposition of organic matter, which enhances the bioavailability of nutrients such as phosphorus and nitrogen for the crops.

Due to its high adaptability, this biological agent functions effectively across various environments, promoting a healthier soil microbiome and supporting more sustainable agricultural practices.

This biocontrol agent is widely used to combat soil-borne pathogens, including major species like Fusarium, Pythium, Rhizoctonia, and Phytophthora, which cause root rots and damping-off.

It also demonstrates efficacy against aerial diseases such as gray mold (Botrytis), powdery mildew, and various types of leaf spot diseases in crops like tomatoes, cucumbers, and berries.

The application is suitable for a wide range of horticultural crops, cereals, and industrial plantations, particularly in nurseries where healthy root development is crucial.

Application rates depend on the specific formulation and method of treatment, with seed dressing typically requiring 2–5 liters of the product per ton of seeds.

For soil treatment, doses usually range from 3 to 10 liters per hectare, depending on the initial pathogen density and the specific crop requirements.

Regular interval applications every 14 to 21 days are recommended to ensure sustained population levels of the beneficial fungus in the soil and on the plant surface throughout the season.

Compatibility with chemical fungicides is limited; therefore, tank mixing with chemical agents should be avoided to prevent the lethal impact on the beneficial Trichoderma spores.

Extreme environmental conditions, such as severe drought or temperatures below 10°C, significantly hinder the development and activity of the organism, requiring adequate moisture for success.

Storage of the bio-product must strictly follow temperature requirements, as prolonged exposure to heat or direct sunlight will cause the loss of efficacy and spore viability.

When transitioning from conventional chemical programs, a waiting period of at least 1–2 weeks is advised to ensure that residual pesticide levels do not neutralize the biocontrol agent.

Field application should avoid midday sun intensity where possible, as strong UV radiation can damage the spores on exposed plant surfaces before they have time to colonize.