Trichoderma paraviridescens

Trichoderma paraviridescens consists of a group of soil-dwelling fungi that act as potent antagonists against various plant pathogens through natural biological control mechanisms.

The primary mechanism is mycoparasitism, where the fungus attaches to the host pathogen's hyphae, penetrates the cell wall, and consumes the internal cytoplasm.

The fungi secrete various extracellular enzymes, such as chitinases and glucanases, which actively degrade the structural integrity of harmful fungal cell walls.

They also engage in direct competition for essential nutrients and ecological niches in the rhizosphere, effectively displacing detrimental microorganisms.

Furthermore, these fungi induce systemic acquired resistance in plants, bolstering the host's natural physiological defense mechanisms against subsequent pathogen attacks.

This group of biological agents is utilized to protect crops against a wide variety of soil-borne diseases and seedling damping-off pathogens.

They are particularly effective in suppressing Fusarium, Pythium, and Rhizoctonia species, which are notorious for causing significant yield losses.

The application is widely used to prevent diseases in vegetable crops, fruits, and cereals, especially in greenhouses and nurseries.

They are effective against leaf-borne diseases as well, including various types of mildews and blights, when applied as a foliar spray.

• Fusarium wilt
• Damping-off (black leg)
• Root rot diseases
• Gray mold (Botrytis)

Application rates vary depending on the product formulation, crop type, and the severity of the pathogen pressure in the soil.

For seed treatment, the typical dosage ranges from 5 to 10 grams of product per kilogram of seeds, ensuring an even coating on the surface.

Soil drenching applications require a diluted solution, typically 0.1-0.5% concentration, applied directly into the plant root zone.

For large-scale agricultural applications, dosage rates are usually recommended at 2-4 kg of the biological agent per hectare.

Re-application is often necessary every 2 to 3 weeks during the vegetative growth phase to maintain an effective population of beneficial spores.

Biological control efficacy is significantly reduced if chemical fungicides are applied simultaneously or shortly before the biological treatment.

Optimal environmental conditions, including soil moisture levels of 60% or more and moderate temperatures of 15-25 degrees Celsius, are crucial for success.

The products must be stored in cool, dark environments as exposure to direct sunlight and high temperatures can kill the spores.

Do not apply the product to soils heavily treated with synthetic chemical sterilants without ensuring proper degradation of those chemicals first.

While safe for human and environmental health, users should still avoid direct inhalation of the spore powder during the mixing and application process.