Streptomyces griseofuscus strain M1A1

Streptomyces griseofuscus strain M1A1 is a biological control agent that utilizes the natural antagonistic properties of soil-dwelling actinobacteria. These microorganisms thrive in the rhizosphere, creating a protective zone around plant roots.

The mode of action relies on the production of secondary metabolites, such as antifungal antibiotics and enzymes that degrade fungal cell walls. This biological activity directly inhibits the growth and sporulation of phytopathogenic fungi.

In addition to direct antagonism, the strain acts by competing for space and nutrients within the plant's environment. By establishing a dominant population, it effectively denies resources to harmful pathogens.

Furthermore, M1A1 triggers Induced Systemic Resistance (ISR) in host plants. This mechanism enhances the plant's natural defensive response to subsequent pathogen attacks, bolstering overall vigor.

Because it is a naturally occurring bacterium, the strain is environmentally friendly and does not leave harmful residues on crops. It is highly valued in organic and integrated pest management systems.

This strain is primarily employed to control a variety of soil-borne and foliar diseases caused by fungi. It is widely used in both greenhouse and open-field agriculture to protect sensitive crops.

• Fusarium wilt in cereals and vegetables
• Powdery mildew on horticultural crops
• Rhizoctonia root rot
• Alternaria leaf blight
• Gray mold (Botrytis) on strawberries and grapes

It is particularly effective when applied as a seed treatment, ensuring early protection against seedling diseases and damping-off. This promotes uniform emergence and healthy growth.

The strain is suitable for the suppression of pathogens in the soil, aiding in the recovery of "tired" soils that have been used for intensive monoculture production.

Application during the active growth phase prevents the spread of leaf spots and ensures the health of the foliage, contributing to higher photosynthetic efficiency and crop quality.

Application rates depend on the specific formulation and the type of crop. For seed treatment, specific concentrations ensure thorough coverage of the seeds with the bacterial suspension.

Foliar sprays are typically applied at 10-14 day intervals during high-risk infection periods. Early morning or evening applications are recommended to avoid degradation of the bacteria by UV light.

Soil application can be achieved through drenching or integration into drip irrigation systems. This method ensures that the bacteria are delivered directly to the root zone where they are most effective.

No mandatory pre-harvest interval (PHI) is required due to the biological nature of the agent. This allows for applications even close to the harvesting stage when chemical options are restricted.

Adjust the number of applications based on the severity of the disease pressure. In high-risk environments, preventive application is far more effective than curative treatment.

Environmental factors significantly influence performance. The bacteria require a temperature range of +15°C to +25°C and adequate moisture to effectively colonize the target area.

Avoid mixing with harsh chemical fungicides that can kill the bacterial colony. If chemical treatments are necessary, observe a waiting period of at least one week between applications.

Protection from direct sunlight is crucial during preparation and application. The storage of the working solution should not be prolonged; use it within a few hours to ensure viability.

Standard safety measures should be followed, including the use of gloves and protective clothing. Avoid inhalation of dust or spray mist during the preparation of the product.

Always store the product in a cool, dark place to maintain spore stability. Do not exceed the expiration date indicated on the packaging, as bacterial viability declines over time.