NOVELTY - Heterocyclic compounds (I) are new.    USE - (I) are useful for controlling pests (claimed), preferably insects.    ADVANTAGE - (I) exhibit good plant compatibility, favorable mammalian toxicity and good environmental compatibility, increases crop yield, and improves quality of crop.    DETAILED DESCRIPTION - Heterocyclic compounds of formula (Q-Y3-G) (I) or their salts, tautomers and/or isomeric forms or N-oxides are new.    Q = thiazol-5-yl, isothiazol-4-yl, substituted 1H-pyrazol-4-yl moieties of formula (IIa), isoxazol-4-yl, pyrazin-2-yl, pyridin-4-yl, pyridin-2-yl or pyridazin-4-yl;    R = H or alkyl;    Y3 = substituted thiazol-2,5-diyl moieties of formula (IIb), substituted 1H-pyrazol-1,4-diyl moieties of formula (IIc), (1,3,4)thiadiazol-2,5-diyl or substituted 1H-pyrazol-3,5-diyl moieties of formula (IId);    R1 = R;    G = 30 substituted heterocyclyl moieties, preferably substituted 1H-pyrazolyl moieties of formula (IIe) or (IIf), substituted oxazolyl moieties of formula (IIg) or (IIh), substituted thiazolyl moieties of formula (IIi) or (IIj), substituted 1H-(1,2,4)triazolyl moieties of formula (IIk), substituted 1,4,5,6-tetrahydropyridazinyl moieties of formula (IIl), substituted 5,6-dihydro-4H-(1,3,4)oxadiazinyl moieties of formula (IIm) or substituted 5,6-dihydro-4H-(1,3,4)thiadiazine moieties of formula (IIn);    G3 = heterocyclyl, preferably dioxanyl, dioxolanyl, dioxepanyl, dioxocanyl, oxathianyl, oxathiolanyl, oxathiepanyl, oxathiocanyl, dithianyl, dithiolanyl, dithiepanyl, dithiocanyl, oxathianyl oxide, oxathiolanyl oxide, oxathiepanyl oxide, oxathiocanyl oxide, oxathianyl dioxide, oxathiolanyl dioxide, oxathiepanyl dioxide, oxathiocanyl dioxide, morpholinyl, triazolinonyl, oxazolinyl, dihydro-oxadiazinyl, dihydro-dioxazinyl, dihydro-oxazolyl, dihydro-oxazinyl or pyrazolinonyl (all optionally substituted by alkyl, haloalkyl, alkoxy or alkoxyalkyl) or cycloalkyl or cycloalkylalkyl (both optionally saturated, optionally substituted and optionally interrupted by at least one heteroatom) or heteroaryl, preferably pyridyl, pyridyl-N-oxide, pyrimidyl, imidazolyl, pyrazolyl, oxazolyl, thiazolyl, furanyl, thienyl, triazolyl, tetrazolyl, oxadiazolyl, thiadiazolyl, pyrazinyl, triazinyl, tetrazinyl or isoquinolinyl (all optionally substituted by halo, NO2, alkyl, haloalkyl, alkoxy, haloalkoxy, alkoxyalkyl, alkylthio, alkylthioalkyl or cycloalkyl) or heteroarylalkyl, preferably triazolyl-alkyl, pyridyl-alkyl, pyrimidyl-alkyl or oxadiazolyl-alkyl (all optionally substituted by halo or alkyl) or phenyl (optionally substituted by halo, CN, NO2, alkyl or haloalkyl), halo, NO2, NH2, CN, alkylamino, haloalkylamino, dialkylamino, alkyl, haloalkyl, alkoxy, haloalkoxy, alkoxyalkyl, haloalkoxyalkyl, bis(alkoxy)alkyl, bis(haloalkoxy)alkyl, alkoxy(alkylsulfanyl)alkyl, alkoxy(alkylsulfinyl)alkyl, alkoxy(alkylsulfonyl)alkyl, bis(alkylsulfanyl)alkyl, bis(haloalkyl-sulfanyl)alkyl, bis(hydroxyalkyl-sulfanyl)alkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alpha-hydroxyimino-alkoxycarbonylalkyl, alpha-alkoxyimino-alkoxycarbonylalkyl, C(X)R3R4, NR6R7, alkylthio, alkylsulfinyl, alkylsulfonyl, -C(=X1)-N(R8)-S(=O)n-R9, -C(=X1)-N(R8)-N(R10)-S(=O)n-R9, -C(=X1)-N(R8)-P(=L)(R12)-R11, -C(=X1)-N=S(R13)-R14, nitrogen-containing heterocyclyl moieties of formula (IIIa), -N(R8)-S(=O)n-R15, -S(=O)n-N(R8)-R16, -S(=O)n-N(R8)-C(=X1)-R17 or -C(=X1)-N(R8)-CN;    X = O, S, NR5 or NOH; either    R3 = H or alkyl; and    R4, R5 = H, alkyl, haloalkyl, cyanoalkyl, alkynyl, cycloalkyl, cycloalkylalkyl, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alkylthioalkyl, aryl or (hetero)arylalkyl; or    R3+R4+N to which R3 and R4 are bonded = ring (optionally containing N, O or S); or    R3+R5+N to which R3 and R5 are bonded = ring; either    R6 = H or alkyl; and    R7 = H, alkyl, haloalkyl, cyanoalkyl, alkynyl, cycloalkyl, cycloalkylalkyl, alkoxy, haloalkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alkylthioalkyl, aryl or (hetero)arylalkyl; or    R6+R7+N to which R6 and R7 are bonded = ring (optionally containing N, O or S);    X1 = O or S;    n = 1 or 2; either    R8 = alkylcarbonyl, alkylsulfonyl or alkoxycarbonyl (all optionally substituted by halo), cycloalkylcarbonyl (optionally substituted by halo, alkyl, alkoxy, haloalkyl or CN), H, alkyl, haloalkyl, cyanoalkyl, alkoxy, haloalkoxy, alkenyl, alkoxyalkyl or cation, preferably mono- or divalent metal ion or ammonium ion (optionally substituted by alkyl or arylalkyl);    R9, R15 = cycloalkyl, cycloalkylalkyl or cycloalkenyl (all containing S, O (where oxygen atoms are not directly adjacent) or N), amino, alkyl, alkenyl, alkynyl, (hetero)aryl or (hetero)arylalkyl (all optionally substituted);    R16 = cycloalkyl, cycloalkylalkyl or cycloalkenyl (all containing S, O (where oxygen atoms are not directly adjacent) or N), alkyl, alkoxy, alkenyl, alkynyl, (hetero)aryl, (hetero)arylalkyl or amino (all optionally substituted) or H; and    R10 = H or alkyl; or    R8+R15+N-S(O)n to which R8 and R15 are bonded, R8+R17+N-C(X) to which R8 and R17 are bonded, R8+R10+N to which R8 and R10 are bonded, R8+R9+N-S(O)n to which R8 and R9 are bonded, R9+R10+N-S(O)n to which R9 and R10 are bonded, R8+R16+N to which R8 and R16 are bonded = optionally saturated and optionally substituted 4-8-membered ring (containing S, O (where oxygen atoms are not directly adjacent) or N and/or at least one carbonyl group);    R17 = cycloalkyl, cycloalkylalkyl or cycloalkenyl (all containing S, O (where oxygen atoms are not directly adjacent) or N), alkyl, alkoxy, alkenyl, alkynyl, (hetero)aryl, (hetero)arylalkyl or amino (all optionally substituted);    L = O or S; either    R11, R12 = alkyl, alkenyl, alkynyl, alkoxy, alkenyloxy, alkynyloxy, cycloalkyl, cycloalkyloxy, cycloalkenyl-oxy, cycloalkyl-alkoxy, alkylthio, alkenylthio, phenoxy, phenylthio, benzyloxy, benzylthio, heteroaryloxy, hetero-arylthio, heteroaryl-alkoxy or heteroaryl-alkylthio; or    R11+R12+P to which R11 and R12 are bonded = optionally saturated and optionally substituted 5-7-membered ring (containing 1 or 2 O (where oxygen atoms are not directly adjacent) or S);    R13, R14 = alkyl, alkenyl, alkynyl, phenyl or phenylalkyl (all optionally substituted);    Y1, Y2 = C=O or S(O)2; and    m = 1-4.    An INDEPENDENT CLAIM is also included for salts, tautomers and/or isomeric forms or N-oxides of (I).