Pythium oligandrum strain B301

Pythium oligandrum strain B301 is an active ingredient in biological plant protection products, categorized as a mycoparasitic agent. Unlike other pathogenic species within the Pythium genus, this specific strain serves as a beneficial microorganism that effectively targets and suppresses various fungal diseases in agricultural soils.

The mechanism of action involves active mycoparasitism and antibiosis. The mycelium of Pythium oligandrum seeks out and attaches to the hyphae of soil-borne pathogens, utilizing them as a nutrient source while secreting enzymes that degrade the structural cell walls of the host fungus, leading to its destruction.

This agent is primarily used on a variety of crops, including cereals, vegetables, and ornamental plants. It is highly effective in managing root rot complexes and damping-off diseases caused by major soil pathogens such as Fusarium spp., Rhizoctonia solani, and other Phytophthora species.

Application practices focus on soil inoculation before planting or seed treatment to ensure the establishment of the agent in the rhizosphere. Because it is a living biological organism, its efficiency is heavily dependent on soil moisture levels, soil temperature, and organic matter content, which facilitate the colonization process.

Safety precautions involve handling the product in accordance with organic farming guidelines. It is generally non-toxic to humans, mammals, and beneficial insects. However, users should avoid mixing it with broad-spectrum chemical fungicides, as these may inhibit the colonization and mycoparasitic activity of the B301 strain.