The invention relates to the use of iminotriazoles of general formula (I), wherein R1 represents aryl or heteroaryl and these radicals can carry one to five groups independently of each other or the aryl- or heteroaryl radical forms a bicyclic system together with a fused phenyl ring, a fused C3-C6 carbocyclic compound or a 5- or 6-membered heterocyclic compound; A is COOR3 or CONR3R4, R3 and R4 being independently of each other, hydrogen, C1-C6-alkyl, C2-C6-alkenyl, C3-C7-cycloalkyl or C1-C6-alkyl-aryl which can optionally be partially or completely halogenised or can carry one to three substituents chosen from the following: C1-C4 alkoxy, C1-C4-halogenalkoxy, C1-C4-alkylthio, C3-C7-cycloalkyl and C5-C7-cycloalkenyl.
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