A compound of Formula: or an agronomically acceptable salt thereof, wherein:- Q is Q1 or Q2 A 1 and A 2 are independently selected from CH and N, wherein A 1 and A 2 are not both CH; X 1 is selected from the group consisting of O, C and (CR e R f); R a, R b, R c, R d, R e and R f are each independently selected from the group consisting of hydrogen and C 1 -C 4 alkyl wherein R a and R c may together form a C 1 -C 3 alkylene chain; R 1 is selected from the group consisting of C 1 -C 6 alkyl-, C 1 -C 6 haloalkyl-, C 1 -C 6 alkoxy-C 1 -C 3 alkyl-, C 1 -C 6 haloalkoxy-C 1 -C 3 alkyl- and phenyl wherein the phenyl is optionally substituted by one or more substituents selected from the group consisting of halogen, C 1 -C 6 alkyl-, C 1 -C 6 alkoxy-, nitro and cyano; R 2 is selected from the group consisting of C 1 -C 6 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 alkoxyC 1 -C 3 alkyl-, C 1 -C 6 haloalkoxyC 1 -C 3 alkyl-, C 1 -C 6 alkoxyC 2 -C 3 alkoxyC 1 -C 3 alkyl-, -(CH 2) n -C 3 -C 6 cycloalkyl, benzyl, phenyl and a five or six-membered heteroaryl, the heteroaryl containing from one to three heteroatoms each independently selected from the group consisting of oxygen, nitrogen and sulphur, and wherein the benzyl, phenyl or heteroaryl 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-, cyano and nitro; R 3 is selected from the group consisting of hydrogen, C 1 -C 4 alkyl and C 1 -C 4 haloalkyl; n = 1, 2 or 3; and p = 0, 1 or 2. Q is Q1 or Q2 A 1 and A 2 are independently selected from CH and N, wherein A 1 and A 2 are not both CH; X 1 is selected from the group consisting of O, C and (CR e R f); R a, R b, R c, R d, R e and R f are each independently selected from the group consisting of hydrogen and C 1 -C 4 alkyl wherein R a and R c may together form a C 1 -C 3 alkylene chain; R 1 is selected from the group consisting of C 1 -C 6 alkyl-, C 1 -C 6 haloalkyl-, C 1 -C 6 alkoxy-C 1 -C 3 alkyl-, C 1 -C 6 haloalkoxy-C 1 -C 3 alkyl- and phenyl wherein the phenyl is optionally substituted by one or more substituents selected from the group consisting of halogen, C 1 -C 6 alkyl-, C 1 -C 6 alkoxy-, nitro and cyano; R 2 is selected from the group consisting of C 1 -C 6 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 alkoxyC 1 -C 3 alkyl-, C 1 -C 6 haloalkoxyC 1 -C 3 alkyl-, C 1 -C 6 alkoxyC 2 -C 3 alkoxyC 1 -C 3 alkyl-, -(CH 2) n -C 3 -C 6 cycloalkyl, benzyl, phenyl and a five or six-membered heteroaryl, the heteroaryl containing from one to three heteroatoms each independently selected from the group consisting of oxygen, nitrogen and sulphur, and wherein the benzyl, phenyl or heteroaryl 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-, cyano and nitro; R 3 is selected from the group consisting of hydrogen, C 1 -C 4 alkyl and C 1 -C 4 haloalkyl; n = 1, 2 or 3; and p = 0, 1 or 2.