Ternary fungicidal compositions comprising as active components 1) boscalid, 2) chlorothalonil and 3) at least one active compound III, selected from groups A) to F): A) azoles; B) strobilurins; C) carboxamides; D) heterocyclic compounds; E) carbamates; F) other fungicides; in a synergistically effective amount, methods for controlling phytopathogenic harmful fungi using compositions of boscalid, chlorothalonil and at least one active compound III, the use of boscalid and chlorothalonil with at least one active compound III for preparing such compositions, and also agents and seed comprising such compositions.