Streptomyces strain K61

Streptomyces strain K61, formerly classified as Streptomyces griseoviridis, is a well-documented biological fungicide used in global agricultural practices. This actinobacterium is highly regarded for its ability to colonize plant roots and establish a protective niche against soil-borne pathogens.

The product functions as a biological control agent. Its primary mechanism of action involves competitive exclusion and the production of metabolites that inhibit the growth and germination of fungal spores. By occupying the root surface, it effectively prevents pathogenic fungi from accessing the host tissue.

The strain is primarily applied to control damping-off diseases and root rots caused by Fusarium, Pythium, Rhizoctonia, and Alternaria species. It is widely used in greenhouse production for various vegetables, ornamentals, and herb crops throughout the growing season.

Application strategies generally involve soil drenching, substrate incorporation, or seed treatment. For optimal results, the application should occur before the onset of disease symptoms, as the bacterium needs sufficient time to establish a stable population in the rhizosphere.

Users must note that Streptomyces strains are sensitive to certain chemical fungicides; therefore, tank mixing or sequential applications should be planned carefully to ensure microbial viability. Proper storage in a cool, dry place is essential to maintain the shelf life and efficacy of the biological agent.