A compound of Formula (I): ** Formula ** or one of its agronomically acceptable salts, where: - X is O or S； A1 is CH or N； A2 is N or CR3； A3 is N or CR4； A4 is N or CR5； A5 is N or CH； wherein R1 is selected from the group consisting of C1-C6 alkyl, C1-C6 haloalkyl and (C1-C6 alkoxy) - (C1-C3 alkyl)； R2 is selected from the group consisting of hydrogen, C1-C6 alkyl, C1-C6 haloalkyl, (C1-C3 alkoxy) - (C1-C3 alkyl), (C1-C3 haloalkoxy) - (C1-C3 alkyl), (C1 alkoxy -C3) - (C1-C3 alkoxy) - (C1-C3 alkyl), (C1-C3 alkoxy) - (C1-C3 haloalkyl), (C1-C3 alkoxy) - (C1-C3 alkoxy) - (C1-haloalkyl) C3), (C4-C6 oxo substituted cycloalkoxy) - (C1-C3 alkyl), (C4-C6 oxo substituted cycloalkyl) - (C1-C3 alkoxy) - (C1-C3 alkyl), (C4-C6 oxo substituted cycloalkoxy) - (haloalkyl C1-C3), (C4-C6 cycloalkyl oxosubstituted) - (C1-C3 alkoxy) - (C1-C3 haloalkyl), ((C1-C3 alkanesulfonyl) - (C1-C3 alkylamino)) - (C1-C3 alkyl), ((C1-C3 alkanesulfonyl) - (C3-C4 cycloalkylamino) - (C1-C3 alkyl), (C1-C6 alkylcarbonyl) - (C1-C3 alkyl), (C3-C6 cycloalkyl) - (C2-C6 alkenyl) , C2-C6 alkynyl, C2-C6 alkenyl, C2-C6 haloalkenyl, cyano- (C1-C6 alkyl), arylcarbonyl- (C1-C3 alkyl) (where the aryl may be optionally substituted with one or more substituents of the group consisting of halogen, C1-C3 alkoxy, C1-C3 alkyl, ha C1-C3-loalkyl), aryl- (C1-C6 alkyl), aryloxy- (C1-C6 alkyl) (where in both cases the aryl can be optionally substituted with one or more substituents of the group consisting of halogen, C1-C3 alkoxy, C1-C3 alkyl, C1-C3 haloalkyl), and a three- or ten-membered mono- or bicyclic ring system, which may be aromatic, saturated or partially saturated and may contain from 1 to 4 heteroatoms each selected independently from the group consisting of nitrogen, oxygen and sulfur, the ring system being optionally substituted with one or more substituents selected from the group consisting of C1-C3 alkyl, C1-C3 haloalkyl, C2-C3 alkenyl, C2-C3 alkynyl, C1-C3 alkoxy, haloalkoxy C1-C3, (C1-C6 alkyl) -S (O) p-, (
