The B-300 preparation is a biological preparation containing the Penicillium bilaii P201/P208 strain with a titer of 3.0 x 10^9 IU/ml. The preparation is used in the agricultural sector for application on corn. The manufacturer of the preparation is the company "Monsanto Ukraine" located in Ukraine. The preparation belongs to the category of biological agents and may be used within the framework of plant protection. The preparation does not contain chemical active substances, making it ecologically safe for use.