1-ARYL-5-HYDRAZINO-PYRAZOLE

Herbicidally active 1-aryl-5-hydrazinopyrazoles of the formula in which R1 represents hydrogen or alkyl, R2 represents cyano or nitro, R3 represents hydrogen, or represents in each case optionally substituted alkyl, alkenyl, alkinyl or cycloalkyl, or represents a radical or represents a radical -SO2-R7, R4 represents hydrogen, or represents in each case optionally substituted alkyl, alkenyl, alkinyl or cycloalkyl, or represents a radical or represents a radical -SO2-R7, R5 represents hydrogen: or, in the case where R4 represents hydrogen, also represents a radical or represents a radical -SO2-R7, or represents in each case optionally substituted alkyl, alkenyl, alkinyl or cycloalkyl, wherein, in each case, X represents oxygen or sulphur, R6 represents hydrogen, alkyl, alkoxy, alkoxyalkyl, alkylthio, alkylthioalkyl, alkylamino, dialkylamino, halogenoalkyl, alkenyl or alkinyl, or represents optionally substituted cycloalkyl, or represents in each case optionally substituted aryl, aryloxy, arylthio or arylamino and R7 represents alkyl, hydroxyalkyl, alkoxyalkyl, halogenoalkyl, alkenyl, alkinyl or cycloalkyl, or represents in each case optionally substituted aralkyl or aryl and Ar represents substituted phenyl, or represents optionally substituted pyridyl.