Bacillus amyloliquefaciens strain PTA-4838

The active substance based on Bacillus amyloliquefaciens strain PTA-4838 belongs to the class of biological fungicides of microbial origin. These beneficial soil bacteria colonize the rhizosphere or plant surface upon application, creating a protective biofilm.

The primary mechanism of action involves direct competition for space and nutrients with phytopathogens. By consuming root exudates, these bacteria deprive pathogenic fungi of the opportunity to attach to the plant and initiate infection.

This strain is capable of synthesizing specific antimicrobial peptides such as iturins, surfactins, and fengycins. These compounds disrupt the cell walls and membranes of harmful microorganisms, providing significant fungistatic and bacteriostatic activity.

In addition to direct suppression, the PTA-4838 strain stimulates induced systemic resistance (ISR) in crops. The plant activates its own defense mechanisms, increasing immunity to both biotic and abiotic stresses.

The biological efficacy of the product is maintained across a wide range of soil conditions, making it a robust component of Integrated Pest Management (IPM) systems.

Plant protection products based on this strain are used to control a broad spectrum of fungal and bacterial diseases. They are particularly effective against pathogens that cause root and collar rots.

The product shows excellent results in suppressing pathogens such as Fusarium wilt, Alternaria, Botrytis, and powdery mildew on a variety of vegetable and field crops.

It is also actively used for seed treatment to protect against seedling diseases, which significantly improves field emergence and seedling vigor.

Due to its biological nature, the PTA-4838 strain is well-suited for use in organic farming, where the use of synthetic chemical fungicides is restricted or prohibited.

Application is possible on cereals, vegetables, fruit crops, and ornamental plants where environmentally safe disease control is required.

Application rates depend on the method of use: seed treatment, soil application during sowing, or foliar spraying of crops. Work solutions should be prepared according to the manufacturer's label requirements.

For seed treatment, thorough coverage of the surface is recommended to ensure the formation of a protective film of bacterial spores.

Foliar spraying should be performed as a preventive measure before the disease spreads. Regular applications every 10–14 days are recommended, depending on weather conditions and disease pressure.

The product's effectiveness is maximized at temperatures between +15 and +25 degrees Celsius with sufficient soil moisture, which promotes the rapid multiplication of the beneficial bacteria.

Do not mix the product with aggressive chemical bactericides, as this may lead to the death of the beneficial microbial colony and reduce biological activity.

The main limitation is the incompatibility with certain chemical pesticides. The use of harsh chemical fungicides and bactericides in tank mixes can suppress the growth and development of the PTA-4838 strain.

The product is sensitive to ultraviolet radiation, so foliar application should ideally take place during morning or evening hours to allow the bacteria to colonize the plant surface before direct sunlight exposure.

Avoid the use of chlorinated water for preparing work solutions, as chlorine is harmful to live Bacillus amyloliquefaciens cultures.

The product must be stored in a cool, dark place in accordance with the manufacturer's instructions to maintain the viability of the spores throughout the shelf life.

While biofungicides of this type are considered low-toxicity to humans, animals, and pollinators, standard safety precautions should be followed during handling and application.