Fungicidal mixtures, comprising1) a fungicidal strain (I) which is Bacillus substilis strain with NRRL Accession No. B-21661, andand2) at least one chemical compound II which is silthiofam;in a synergistically effective amount, methods for controlling harmful fungi using compositions of components 1) and 2), the use of a component 1) with a component 2) for preparing such compositions, and also fungicidal agents and seed comprising such compositions.