607381 Disclosed are 5-iodo-triazole derivatives of formula I for example 1-(4-bromophenyl)-1-(1-phenoxycyclopropyl)-2-(5-iodo-1H-1,2,4-triazol-1-yl)ethanol. Also disclosed is a method for producing said compounds, agents containing said compounds, and the use thereof as biologically active compounds, in particular for fighting harmful microorganisms in plant protection, in material protection, and as plant growth regulators.