Bayer Serenade Opti 10lb ( QST 713 strain of Bacillus subtilis ) — Single Unit

Serenade® Opti is a biological fungicide and bactericide that works in three different ways to fight disease-causing pathogens. Stopping harmful spores from germinating, it disrupts the cell membrane growth and inhibits attachment of the pathogen to the leaf. The multiple sites of action not only create an effective fungicide, but also make it very difficult for diseases to develop resistance