New thiolphosphoric acid-S-4-nitro-2-trichloromethylphenyl esters of the formula ##STR1## where X denotes oxygen or sulfur, and R.sup.1 and R.sup.2 are identical or different and each denotes a substituted or unsubstituted aliphatic radical of 1 to 18 carbon atoms or a substituted or unsubstituted alicyclic radical of 5 to 18 carbon atoms, processes for their manufacture, fungicides containing these compounds as active ingredients, their manufacture, and processes for combating fungi with these novel compounds.