A compound of formula (I): ** Formula ** or its agriculturally acceptable salt, where: A1 and A2 are independently selected from CH and N, where A1 and A2 are not both CH； R1 is selected from the group consisting of C1-C6 alkyl, C1-C6 haloalkyl and C1-C6 alkoxyC1-C3 alkyl； R2 is selected from the group consisting of halogen, -NHR5 and -O-R6； R3 is selected from the group consisting of hydrogen, halogen, C1-C6 alkyl, haloC1-C6 alkyl, C1-C6 alkoxyC1-C3 alkyl, benzyl and phenyl, where benzyl and phenyl are optionally substituted with one or more substituents that are selected from the group consisting of halogen, C1-C6 alkyl, cyano, nitro, haloC1-C6 alkyl, C1-C6-S (O) p-, aryl-S (O) p-, C1-C6 alkoxy and C1-C6 alkoxy； R4 is selected from the group consisting of C1-C6 alkyl, C3-C6 cycloalkyl and C1-C6 haloalkyl； R5 is selected from the group consisting of C1-C6 alkyl, haloC1-C6 alkyl, C1-C6 alkoxyC1-C3 alkyl, benzyl and phenyl, where the benzyl and phenyl groups are optionally substituted with one or more substituents that are selected from the group consisting of halogen , C1-C6 alkyl, cyano, nitro, C1-C6 haloalkyl, C1-C6-S (O) p- alkyl, S-aryl (O) p-, C1-C6 alkoxy and C1-C6 haloalkoxy； R6 is selected from the group consisting of hydrogen, C1-C6 alkyl, C1-C6 haloalkyl and C1-C6 alkoxyC1-C3 alkyl； and p>； = 0, 1 or 2；Un compuesto de fórmula (I):**Fórmula** o su sal agrícolamente aceptable, donde: A1 y A2 se seleccionan independientemente de CH y N, donde A1 y A2 no son ambos CH； R1 se selecciona del grupo que consiste en alquiloC1-C6, haloalquiloC1-C6 y alcoxiC1-C6alquiloC1-C3； R2 se selecciona del grupo que consiste en halógeno, -NHR5 y -O-R6； R3 se selecciona del grupo que consiste en hidrógeno, halógeno, alquiloC1-C6, haloalquiloC1-C6, alcoxiC1- C6alquiloC1-C3, bencilo y fenilo, donde el bencilo y el fenilo se encuentran opcionalmente sustituidos con uno o más sustituyentes que se seleccionan del grupo que consiste en halógeno, alquiloC1-C6, ciano, nitro, haloalquil
