Bacillus amyloliquefaciens strain QST 713

Bacillus amyloliquefaciens strain QST 713 is a specialized spore-forming bacterium used globally as an active biological agent for crop protection.

The core mechanism involves site competition, where the beneficial bacteria occupy surfaces on leaves and roots, preventing pathogenic fungi from establishing.

The strain produces lipopeptides, specifically iturins and surfactins, which disrupt the cell membranes of targeted pathogens, leading to their inactivation.

In addition to direct destruction, the bacteria secrete enzymes that decompose the cell walls of harmful fungi, inhibiting their development and growth cycles.

Regular applications promote induced systemic resistance in crops, strengthening their inherent ability to withstand biotic and abiotic environmental stresses.

This biological strain is highly effective against a broad array of fungal pathogens that impact yields across diverse agricultural environments.

Common targets include causal agents of powdery mildew, botrytis, and various leaf spot diseases that threaten the vitality of crops.

• Powdery mildew (Erysiphales).
• Gray mold (Botrytis cinerea).
• Fusarium wilt species.
• Various bacterial infections attacking fruits and vegetables.

It is widely utilized in field production, orchards, and greenhouse environments to provide a preventative shield against recurring seasonal diseases.

The strain's efficacy is highest when preventative measures are taken before visible symptoms of the infection appear on the plant surface.

Application rates generally range from 1 to 5 liters (or kg) per hectare, depending on the crop growth stage and the severity of the disease pressure.

The product should be applied as a foliar spray to ensure uniform coverage, which is essential for creating a continuous protective layer of bacteria.

Re-application intervals typically vary between 7 to 14 days, helping to maintain an optimal population of beneficial bacteria on the plant organs.

It is generally compatible with most standard agricultural chemicals, making it an excellent candidate for integrated pest management (IPM) programs.

There are minimal pre-harvest interval requirements, allowing for flexible application schedules even close to the harvest period without residue concerns.

Environmental conditions, particularly temperature and humidity, play a critical role in the bacterial survival and overall effectiveness of the product.

Avoid applying the product under direct, intense sunlight or extreme temperatures, as these conditions may significantly reduce the viability of the spores.

The use of strong bactericidal agents in tank mixes should be avoided, as these can adversely affect the colonization of the beneficial Bacillus strain.

Standard personal protective equipment should be used during mixing and application, despite the high safety profile of this biological agent.

Always store the product in a cool, dark environment to ensure the bacterial titer remains within the manufacturer's specifications until the expiration date.