Benzylidene pyrazolones, production and use thereof

A benzylidenepyrazolone of the formula I,

• where the substituents and the index n have the following meanings:
• R1 is unsubstituted or substituted C1-C6-alkyl;
• R2 is unsubstituted or substituted C1-C6-alkyl, unsubstituted or substituted C1-C6-alkoxy, halogen, nitro or cyano;
• R3 is hydrogen, halogen, nitro, cyano, a group NR5R6, OCOR5, NR5COR6, CO2R5, —COSR5, —CONR5R6, C1-C4-alkoxyiminoalkyl, C1-C6-alkylcarbonyl, unsubstituted or substituted C1-C6-alkyl, unsubstituted or substituted C1-C6-alkoxy, unsubstituted or substituted C1-C6-alkylthio, unsubstituted or substituted C2-C6-alkenyl, unsubstituted or substituted C2-C6-alkynyl, unsubstituted or substituted phenyl, unsubstituted or substituted phenoxy, an unsubstituted or substituted 5- or 6-membered saturated or unsaturated heterocycle which may contain up to 4 nitrogen atoms and/or up to 2 oxygen or sulfur atoms as ring members;
• R4 is C1-C6-alkyl or C1-C4-haloalkyl;
• or
• R3 and R4 form an optionally substituted saturated or unsaturated 2- or 3-membered bridge which may contain a sulfur atom which may be oxidized to give sulfoxide or sulfone;
• R5 is hydrogen or unsubstituted or substituted C1-C6-alkyl;
• R6 is unsubstituted or substituted C1-C6-alkyl;
• R7 is hydrogen, C1-C6-alkyl or C1-C4-haloalkyl;
• n is 0, 1 or 2;
• X is hydrogen, chlorine or bromine;
• where the compounds claimed may be present both in the trans and in the cis form or as a mixture of these isomers.