Composition comprising isosorbide monoesters and isosorbide diesters

A method for controlling a fungus, comprising the step of applying a composition comprising at least one or more compound of the formula (I) and at least one compound of the formula (II)

• in which
• R, Ra and Rb are each independently of one another straight-chain or branched saturated alkyl groups having 5 to 11 carbon atoms or straight-chain or branched mono- or polyunsaturated alkenyl groups having 5 to 11 carbon atoms, wherein the total amount of the compounds of the formulae (I) and (II), based on the total weight of the composition, is at least 60% by weight, where the composition, in addition to the compounds of the formulae (I) and (II), comprises at least one other substance selected from the group consisting of sorbitol, sorbitol esters, sorbitan, sorbitan esters, isosorbide and carboxylic acids and the hydroxyl value of the mixture of the compounds of the formulae (I) and (II) and additionally the one or more compounds selected from the group consisting of sorbitol, sorbitol esters, sorbitan, sorbitan esters, isosorbide and carboxylic acids is smaller than or equal to 250 to the fungus.