Biotransik i209 PS — a biological preparation intended for use in agriculture. It is used as a seed treatment for corn at a dosage of 36–100 g per 100 kg of seed, applied once. The preparation contains Mucor brunneogriseus strain SYM15777 at a concentration of not less than 1.0*105 CFU/g. The manufacturer is the company Indigo Ag, Inc., located in the USA. The preparation is intended for use in agricultural crops to improve seed quality and enhance plant resistance to stress factors. The preparation is applied by treating seeds prior to sowing, which ensures better germination and crop development.