1. A biocidal composition comprising (a) herbicides； (b) fatty acid amides； (c) fatty acids； and optionally (d) emulsifiers and / or (e) polyols. 2. A composition according to claim 1, characterized in that said herbicides (compound a) are solids. A composition according to claim 1, characterized in that said herbicides have a solubility in water of less than 5 g / l at a temperature of 20 ° C and a water hardness of at most 1000 ppm. A composition according to claim 1, characterized in that said herbicide is piraflufen-ethyl. A composition according to claim 1, characterized in that said fatty acid amides (compound b) are described by the general formula (I) RCONRR (I), in which RCO is a linear or branched, saturated or unsaturated, optionally hydroxyl-substituted acyl radical containing from 2 to 22 carbon atoms and 0 or from 1 to 3 double bonds, and R and R independently mean hydrogen or alkyl radicals containing from 1 to 12 carbon atoms. 6. A composition according to claim 1, characterized in that said fatty acid amides are formed from fatty acids containing from 6 to 10 carbon atoms, or from lactic acid. A composition according to claim 1, characterized in that said fatty acid amides are fatty acid dialkylamides. A composition according to claim 1, characterized in that said fatty acid amides are fatty acid dimethylamides. A composition according to claim 1, characterized in that said fatty acid amides are CC-fatty acid dimethylamides. 10 A composition according to claim 1, characterized in that said fatty acids (compound C) are described by the general formula (II) RCO-OH ( II), in which RCO means linear or branched, n�1. Биоцидная композиция, содержащая(a) гербициды；(b) амиды жирных кислот；(c) жирные кислоты； и необязательно(d) эмульгаторы и/или(e) полиолы.2. Композиция по п. 1, отличающаяся тем, что указанные гербициды (соединение а) являются твердыми веществами.3. Композиция по п. 1, отличающаяся тем, что указанные гербициды обладают растворимостью в воде,
