balEnce Fly Spray 15oz Bottle - BALANCE15EPA approved for organic programs, balEnce Fly Spray is a liquid suspension of the beneficial fungus Beauveria bassiana. The Beauveria bassiana spores infect and parasitize flies when the flies come in contact with the fungus. Once applied, flies die in approximately 36 hours. BalEnce Fly Spray maintains a residual effect in the treated areas for up to about 21 days. Be sure to read the information for fly control in equine, swine, poultry, and dairy