A compound of Formula: or an agronomically acceptable salt thereof, wherein:- A 1a and A 1b are independently selected from CH and N, wherein A 1a and A 1b are not both CH; R 1 is selected from the group consisting of C 1 -C 6 -alkyl-, C 1 -C 6 -alkoxyC 1 -C 3 -alkyl-, C 1 -C 6 haloalkoxyC 1 -C 3 alkyl-, C 1 -C 6 haloalkyl-, C 2 -C 6 alkenyl-, C 2 -C 6 -haloalkenyl-, C 2 -C 6 alkynyl-, C 2 -C 6 haloalkynyl-, heteroaryl-, (C 3 -C 7)-cycloalkyl-, heterocyclyl- and phenyl-, wherein the heteroaryl-, (C 3 -C 7)-cycloalkyl-, heterocyclyl- and phenyl- are optionally substituted by one or more substituents selected from the group consisting of halogen, nitro, cyano, C 1 -C 6 alkyl-, C 1 -C 6 haloalkyl-, C 3 -C 6 cycloalkyl-, C 1 -C 6 alkyl-S p-, C 1 -C 3 alkoxy- and C 1 -C 6 alkoxyC 1 -C 4 alkyl-; R 2 is selected form the group consisting of C 1 -C 6 alkyl-, C 1 -C 6 alkoxy-, C 1 -C 6 haloalkyl-, C 1 -C 6 haloalkoxy-, C 1 -C 6 alkoxyC 1 -C 6 alkyl-, C 1 -C 3 alkoxyC 2 -C 3 alkoxyC 1 -C 3 alkyl-, C 1 -C 3 alkoxyC 1 -C 3 -haloalkyl-, C 1 -C 3 -alkoxyC 1 -C 3 -alkoxyC 2 -C 3 haloalkyl-, halogen, cyano, nitro, C 1 -C 6 alkyl-S p-, C 1 -C 6 haloalkyl-S p -, C 4 -C 6 -oxasubstituted-cycloalkoxyC 1 -C 3 alkyl-, C 4 -C 6 -oxasubstituted-cycloalkoxy-C 1 -C 3 haloalkyl-, (C 1 -C 3 alkanesulfonyl-C 1 -C 3 alkylamino)-C 1 -C 3 alkyl- and (C 1 -C 3 alkanesulfonyl-C 3 -C 4 cycloalkylamino)-C 1 -C 3 alkyl-; R 3 is aryl or a 5 or 6-membered heteroaryl, the heteroaryl containing one to three heteroatoms each independently selected from the group consisting of oxygen, nitrogen and sulphur, and wherein the aryl or heteroaryl component may be optionally substituted by one or more substituents selected from the group consisting of halogen, C 1 -C 6 alkyl-, C 2 -C 6 alkenyl-, C 2 -C 6 alkynyl-, C 1 -C 6 haloalkyl-, C 1 -C 6 alkoxy-, C 1 -C 6 alkoxyC 1 -C 3 alkyl-, C 1 -C 6 alkoxyC 1 -C 3 alkoxy-, C 1 -C 6 haloalkoxy-, C 1 -C 6 alkyl-S p-, -NR 6a R 6b, cyano and nitro; R 4 is selected from the group consisting of hydrogen, halogen, C 1 -C 6 alkyl-, C 3 -C 6 cycloalkyl-, C 1 -C 6 alkoxy-C 1 -C 3 alkyl-, C 1 -C 6 -haloalkoxyC 1 -C 3 -alkyl-, C 1 -C 6 haloalkyl-, C 2 -C 6 alkenyl-, C 2 -C 6 haloalkenyl-, C 2 -C 6 alkynyl-, C 2 -C 6 haloalkynyl-, C 1 -C 6 alkoxy-, C 1 -C 6 alkyl-S p- and -NR 6a R 6b; R 5 is selected from the group consisting of hydrogen, halogen and C 1 -C 6 alkyl-; R 6a and R 6b are independently selected from the group consisting of hydrogen and C 1 -C 6 alkyl or together form a C 4 -C 5 alkylene chain; and p = 0, 1 or 2. A 1a and A 1b are independently selected from CH and N, wherein A 1a and A 1b are not both CH; R 1 is selected from the group consisting of C 1 -C 6 -alkyl-, C 1 -C 6 -alkoxyC 1 -C 3 -alkyl-, C 1 -C 6 haloalkoxyC 1 -C 3 alkyl-, C 1 -C 6 haloalkyl-, C 2 -C 6 alkenyl-, C 2 -C 6 -haloalkenyl-, C 2 -C 6 alkynyl-, C 2 -C 6 haloalkynyl-, heteroaryl-, (C 3 -C 7)-cycloalkyl-, heterocyclyl- and phenyl-, wherein the heteroaryl-, (C 3 -C 7)-cycloalkyl-, heterocyclyl- and phenyl- are optionally substituted by one or more substituents selected from the group consisting of halogen, nitro, cyano, C 1 -C 6 alkyl-, C 1 -C 6 haloalkyl-, C 3 -C 6 cycloalkyl-, C 1 -C 6 alkyl-S p-, C 1 -C 3 alkoxy- and C 1 -C 6 alkoxyC 1 -C 4 alkyl-; R 2 is selected form the group consisting of C 1 -C 6 alkyl-, C 1 -C 6 alkoxy-, C 1 -C 6 haloalkyl-, C 1 -C 6 haloalkoxy-, C 1 -C 6 alkoxyC 1 -C 6 alkyl-, C 1 -C 3 alkoxyC 2 -C 3 alkoxyC 1 -C 3 alkyl-, C 1 -C 3 alkoxyC 1 -C 3 -haloalkyl-, C 1 -C 3 -alkoxyC 1 -C 3 -alkoxyC 2 -C 3 haloalkyl-, halogen, cyano, nitro, C 1 -C 6 alkyl-S p-, C 1 -C 6 haloalkyl-S p -, C 4 -C 6 -oxasubstituted-cycloalkoxyC 1 -C 3 alkyl-, C 4 -C 6 -oxasubstituted-cycloalkoxy-C 1 -C 3 haloalkyl-, (C 1 -C 3 alkanesulfonyl-C 1 -C 3 alkylamino)-C 1 -C 3 alkyl- and (C 1 -C 3 alkanesulfonyl-C 3 -C 4 cycloalkylamino)-C 1 -C 3 alkyl-; R 3 is aryl or a 5 or 6-membered heteroaryl, the heteroaryl containing one to three heteroatoms each independently selected from the group consisting of oxygen, nitrogen and sulphur, and wherein the aryl or heteroaryl component may be optionally substituted by one or more substituents selected from the group consisting of halogen, C 1 -C 6 alkyl-, C 2 -C 6 alkenyl-, C 2 -C 6 alkynyl-, C 1 -C 6 haloalkyl-, C 1 -C 6 alkoxy-, C 1 -C 6 alkoxyC 1 -C 3 alkyl-, C 1 -C 6 alkoxyC 1 -C 3 alkoxy-, C 1 -C 6 haloalkoxy-, C 1 -C 6 alkyl-S p-, -NR 6a R 6b, cyano and nitro; R 4 is selected from the group consisting of hydrogen, halogen, C 1 -C 6 alkyl-, C 3 -C 6 cycloalkyl-, C 1 -C 6 alkoxy-C 1 -C 3 alkyl-, C 1 -C 6 -haloalkoxyC 1 -C 3 -alkyl-, C 1 -C 6 haloalkyl-, C 2 -C 6 alkenyl-, C 2 -C 6 haloalkenyl-, C 2 -C 6 alkynyl-, C 2 -C 6 haloalkynyl-, C 1 -C 6 alkoxy-, C 1 -C 6 alkyl-S p- and -NR 6a R 6b; R 5 is selected from the group consisting of hydrogen, halogen and C 1 -C 6 alkyl-; R 6a and R 6b are independently selected from the group consisting of hydrogen and C 1 -C 6 alkyl or together form a C 4 -C 5 alkylene chain; and p = 0, 1 or 2.