The present invention relates to novel active compound combinationscomprising, firstly, a knownherbicide selected from the group consisting of glyphosate, glufosinate andglufosinate-ammoniumand, secondly, at least one known fungicidally active compound, whichcombination is highlysuitable for controlling unwanted phytopathogenic fungi, in particular soyabean rust. Particularpreference is given to using these mixtures on transgenic plants resistant tothe herbicides mentioned.