A newly discovered fungus Bipolaris imperatae which possesses herbicidal effects on grassy weed species such as cogongrass (Imperata cylindrica), methods of applying Bipolaris imperatae fungus as a mycoherbicide to control growth of cogongrass and similar wild grassy weeds, and compositions containing an effective amount of Bipolaris imperatae fungus and an agriculturally acceptable carrier to control growth of cogongrass and similar weeds.
