A compound of formula, wherein, K is a 6- membered heteroaryl ring selected from the group consisting of K 1 to K 13, wherein, * represent point of attachement to X 1; R 1 is selected from the group consisting of hydrogen, halogen, cyano, hydroxy, formyl, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 1 -C 6 haloalkyl, C 2 -C 6 haloalkenyl, C 2 -C 6 haloalkynyl, C 1 -C 6 alkoxy-C 1 -C 6 alkyl, C 1 -C 6 alkylthio-C 1 -C 6 alkyl, C 1 -C 6 alkylsulfinyl-C 1 -C 6 alkyl, C 1 -C 6 alkylsulfonyl-C 1 -C 6 alkyl, C 1 -C 6 alkylcarbonyl, C 1 -C 6 haloalkylcarbonyl, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 alkoxycarbonyl-C 1 -C 6 alkyl, C 1 -C 6 alkylaminocarbonyl, C 1 -C 6 dialkylaminocarbonyl, Ci-C 6 alkoxy, C 1 -C 6 haloalkoxy, C 1 -C 6 alkylthio, C 1 -C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, Ci-C 6 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl and C 1 -C 6 haloalkylsulfonyl; n is an integer selected from 0 to 3; X' is -O-, -S 0-2 - or -NR 2 -; R 2 is selected from the group consisting of hydrogen, cyano, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy and C 3 -C 6 cycloalkyl; W 1 is O or S; Hy is selected from the group consisting of Hy-1 and Hy-2 optionally substituted by R Hy selected from hydrogen and halogen; # indicates the point of attachment to piperidine; * * indicates the point of attachment to A; A is selected from A 1 or A 2 R 3 is selected from the group consisting of C 1 -C 6 alkyl and C 3 -C 6 cycloalkyl group; or A and a contiguous phenyl ring together represent a fragment A 3, R 4 is selected from the group consisting of hydrogen, halogen, cyano, hydroxy, formyl, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 4 cycloalkyl C 1 -C 6 haloalkyl, C 2 -C 6 haloalkenyl, C 2 -C 6 haloalkynyl, C 1 -C 6 alkoxy-C 1 -C 6 alkyl, C 1 -C 6 alkylthio-C 1 -C 6 alkyl, C 1 -C 6 alkylsulfinyl-C 1 -C 6 alkyl, C 1 -C 6 alkylsulfonyl-C 1 -C 5 alkyl, C 1 -C 6 alkylcarbonyl, C 1 -C 6 haloalkylcarbonyl, C 1 -C 6 alkoxycarbonyl, Ci-C 6 alkoxycarbonyl-C 1 -C 6 alkyl, C 1 -C 6 alkylaminocarbonyl, C 1 -C 6 dialkylaminocarbonyl, C 1 -C 6 alkoxy, C 2 -C 6 alkenyloxy, C 2 -C 6 alkynyloxy, C 1 -C 6 haloalkoxy, C 1 -C 6 alkylthio, Ci-C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 5 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl and Ci-C 6 haloalkylsulfonyl, C 1 -C 6 alkylsulfinyloxy, C 1 -C 6 haloalkylsulfinyloxy, C 1 -C 6 alkylsulfonyloxy, Ci-C 6 haloalkylsulfonyloxy, C 2 -C 6 alkynyloxy and C 3 -C 4 cycloalkyloxy; R 4 may optionally be substituted with one or more substituents selected from the group consisting of halogen, cyano, C 1 -C 4 alkyl, C 2 -C 4 alkenyl, C 2 -C 4 alkynyl, C 1 -C 4 alkoxy-, C 3 -C 4 cycloalkyl and C 1 -C 4 alkylthio; m is an integer selected from 1 to 5; or salts, stereoisomers, metal complexes, N -oxides and polymorphs thereof. K is a 6- membered heteroaryl ring selected from the group consisting of K 1 to K 13, wherein, * represent point of attachement to X 1; R 1 is selected from the group consisting of hydrogen, halogen, cyano, hydroxy, formyl, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 1 -C 6 haloalkyl, C 2 -C 6 haloalkenyl, C 2 -C 6 haloalkynyl, C 1 -C 6 alkoxy-C 1 -C 6 alkyl, C 1 -C 6 alkylthio-C 1 -C 6 alkyl, C 1 -C 6 alkylsulfinyl-C 1 -C 6 alkyl, C 1 -C 6 alkylsulfonyl-C 1 -C 6 alkyl, C 1 -C 6 alkylcarbonyl, C 1 -C 6 haloalkylcarbonyl, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 alkoxycarbonyl-C 1 -C 6 alkyl, C 1 -C 6 alkylaminocarbonyl, C 1 -C 6 dialkylaminocarbonyl, Ci-C 6 alkoxy, C 1 -C 6 haloalkoxy, C 1 -C 6 alkylthio, C 1 -C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, Ci-C 6 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl and C 1 -C 6 haloalkylsulfonyl; n is an integer selected from 0 to 3; X' is -O-, -S 0-2 - or -NR 2 -; R 2 is selected from the group consisting of hydrogen, cyano, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy and C 3 -C 6 cycloalkyl; W 1 is O or S; Hy is selected from the group consisting of Hy-1 and Hy-2 optionally substituted by R Hy selected from hydrogen and halogen; # indicates the point of attachment to piperidine; * * indicates the point of attachment to A; A is selected from A 1 or A 2 R 3 is selected from the group consisting of C 1 -C 6 alkyl and C 3 -C 6 cycloalkyl group; or A and a contiguous phenyl ring together represent a fragment A 3, R 4 is selected from the group consisting of hydrogen, halogen, cyano, hydroxy, formyl, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 4 cycloalkyl C 1 -C 6 haloalkyl, C 2 -C 6 haloalkenyl, C 2 -C 6 haloalkynyl, C 1 -C 6 alkoxy-C 1 -C 6 alkyl, C 1 -C 6 alkylthio-C 1 -C 6 alkyl, C 1 -C 6 alkylsulfinyl-C 1 -C 6 alkyl, C 1 -C 6 alkylsulfonyl-C 1 -C 5 alkyl, C 1 -C 6 alkylcarbonyl, C 1 -C 6 haloalkylcarbonyl, C 1 -C 6 alkoxycarbonyl, Ci-C 6 alkoxycarbonyl-C 1 -C 6 alkyl, C 1 -C 6 alkylaminocarbonyl, C 1 -C 6 dialkylaminocarbonyl, C 1 -C 6 alkoxy, C 2 -C 6 alkenyloxy, C 2 -C 6 alkynyloxy, C 1 -C 6 haloalkoxy, C 1 -C 6 alkylthio, Ci-C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 5 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl and Ci-C 6 haloalkylsulfonyl, C 1 -C 6 alkylsulfinyloxy, C 1 -C 6 haloalkylsulfinyloxy, C 1 -C 6 alkylsulfonyloxy, Ci-C 6 haloalkylsulfonyloxy, C 2 -C 6 alkynyloxy and C 3 -C 4 cycloalkyloxy; R 4 may optionally be substituted with one or more substituents selected from the group consisting of halogen, cyano, C 1 -C 4 alkyl, C 2 -C 4 alkenyl, C 2 -C 4 alkynyl, C 1 -C 4 alkoxy-, C 3 -C 4 cycloalkyl and C 1 -C 4 alkylthio; m is an integer selected from 1 to 5; or salts, stereoisomers, metal complexes, N -oxides and polymorphs thereof.