Bacillus amyloliquefaciens strain QST 713

Bacillus amyloliquefaciens strain QST 713 is a specialized biological fungicide and bactericide used globally to protect various crops. It is widely recognized for its ability to produce potent secondary metabolites that target a broad range of plant pathogens. As a biological agent, it provides a sustainable alternative to conventional chemical pesticides, making it ideal for organic and integrated pest management systems.

The mode of action of this strain is multifaceted. Upon application, the bacteria colonize the plant tissues and rhizospheres. They synthesize lipopeptides that disrupt the cell membranes of pathogenic fungi, effectively stopping their development. Additionally, the QST 713 strain competes with pathogens for vital nutrients and space on the leaf surface, physically preventing the infection process from initiating.

The product is highly versatile and is registered for use on numerous crops including fruits, vegetables, ornamentals, and field crops. It is particularly effective in controlling diseases such as:

• Powdery mildew and grey mold (Botrytis).
• Downy mildew and various leaf spot diseases.
• Bacterial leaf spot and fire blight.
• Root diseases caused by soil-borne pathogens.

For best application results, it is crucial to apply the product preventatively or at the earliest signs of disease pressure. Since it is a live organism, the environment plays a role in its success; therefore, avoiding high-intensity UV exposure and ensuring optimal humidity will help the bacteria establish their protective colony. It is also compatible with many other biological and chemical agents, allowing for flexible inclusion in complex spray programs.

Regarding safety precautions, Bacillus amyloliquefaciens strain QST 713 is classified as low-toxicity and generally safe for humans, bees, and beneficial wildlife. However, standard hygiene practices, such as wearing gloves and avoiding inhalation of spray mist, should be followed during handling. The product should be stored in a cool, dry area to ensure the viability of the bacterial spores, maintaining high efficacy throughout the growing season.