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Bacillus pumilus strain QST 2808

Bacillus pumilus is a ubiquitous bacterium belonging to the B. subtilis group of bacilli commonly found in soil, water, air, and decomposing plant tissue that contributes to nutrient cycling when not in spore form. The amount of B. pumilus QST 2808 in the environment has not been determined, but bacilli generally occur in population levels of 106 to 107 per gram of soil. Cited studies show that the vast majority of soil bacilli populations are likely to exist in an inactive endospore stage unless soil is amended with organic matter providing readily utilizable nutrients. B. pumilus strain QST 2808 is not toxic or pathogenic to mammals or to other non-target organisms.

The EPA has classified Bacillus pumilus strain QST 2808 as a microbial pesticide active ingredient. SonataTM ASO and QST 2808 MUP contain this active ingredient.


Target Pathogens: Bacterial Spot, Blue Mold, Downy Mildew, Early Blight, Fire Blight, Gray Mold, Gummy Stem Blight, Late Blight, Powdery Mildew, Rust, Sclerotinia Leaf Drop, Scab, White Mold

Mode of Action: B. pumilus strain QST 2808 prevents the germination of fungal spores on plants by forming a physical barrier between the spores and the leaf surface; the bacterium then colonizes the fungal spores. There is evidence that B. pumilus strain QST 2808 may induce systemic acquired resistance (SAR) in plants, resulting in the plants’ becoming more resistant to a variety of pathogens.

Application Tips: Users begin application when conditions are conducive to disease development, and repeat application at 7 to 10 day intervals or as needed.

Applicators and other handlers must wear: • Long-sleeved shirt and long pants
• Shoes plus socks
• Waterproof gloves

Mixers/loaders and applicators must wear a dust/mist filtering respirator meeting NIOSH standards of at least N-95, R-95, or P-95 Repeated exposure to high concentrations of microbial proteins can cause allergic sensitization