O-Benzyloxime ethers of the formula I where X is substituted or unsubstituted CH2, NOalkyl Y is O, S, NR5 R1, R2, R5 are H, alkyl Z1, Z2 are H, halogen, methyl, methoxy, cyano R3, R4 are hydrogen, cyano, substituted or unsubstituted alkyl, alkenyl, cycloalkyl, cycloalkenyl, alkynyl, alkoxy, haloalkoxy, alkylthio, benzylthio, alkylcarbonyl, substituted or unsubstituted phenylcarbonyl, substituted or unsubstituted benzylcarbonyl, alkoxycarbonyl, substituted or unsubstituted phenoxycarbonyl, substituted or unsubstituted benzyloxycarbonyl, N(R6)2, where R6 is H, alkyl, substituted or unsubstituted phenyl, —CO—N(R7)2, where R7 is H, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, substituted or unsubstituted aryloxy, substituted or unsubstituted arylthio, substituted or unsubstituted hetaryl, substituted or unsubstituted hetaryloxy, substituted or unsubstituted hetarylthio, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heterocyclyloxy, R3 and R4 together may form a carbocyclic or heterocyclic ring which is substituted or unsubstituted, and R3 or R4 may be halogen, or  may be  where n is an integer from 1 to 4, and R8 is, or, when n>1, the R8's are identical or different and are each, H, halogen, cyano, nitro or substituted or unsubstituted C1-C4-alkyl, C1-C4-alkoxy, C1-C4-haloalkyl, C1-C4-haloalkoxy, aryl, aryloxy, benzyloxy, hetaryl or hetaryloxy. and crop protection agents containing these compounds.