Fungicide contains a substd, alkyl(thio-, sulphinyl- or sulphonyl-)-heterocyclic cpd. of formula A-S(O)m-A'-X-CO-Q (I) or its salt or N-oxide. A = a gp. of formula (a)-(d); U = CR2 or N; V = CR4 or N; R1-R4 = H, CN, NO2, halo, CONH2, SO2Me, 1-4C alkyl (opt. substd. by halo or 1-4C alkoxy), 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio, 1-4C alkoxy-carbonyl, Ar, OAr or Het; Ar = aryl (opt. mono-, di- or trisubstd. by CN, NO2, halo, 1-4C alkyl (opt. substd. by halo or 1-4C alkoxy), 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio, 1-4C alkoxy-carbonyl or 1-4C acyl); Het = heteroaryl (opt. substd. as for Ar); m, = 0-2; A' = 1,2-ethylidene or 1,3-propylidene opt. substd. by A1 or A2; A1 = 1-8C alkyl, 1-8C haloalkyl, 2-8C alkenyl, 2-8C haloalkenyl or 2-8C alkynyl (all opt. mono-, di- or trisubstd. by CN, 1-4C alkoxy, 1-4C haloalkyl, 1-4C alkylthio, 1-4C alkoxy-carbonyl, 3-7C cycloalkyl or 5-7C cycloalkenyl); A2 = 3-7C cycloalkyl or 5-7C cycloalkenyl (both opt. substd. by 1 or more halo or 1-3 CN, halo, 1-4C alkyl, 1-4C haloalkyl and 1-4C alkoxy); X = O, S or NR5; R5 = H, 1-8C alkyl or 3-7C cycloalkyl; Q = aryl or heteroaryl (opt. opt. mono-, di- or trisubstd. by CN, NO2, halo, 1-4C alkyl (opt. substd. by halo or 1-4C alkoxy), 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio, 1-4C alkoxy-carbonyl, 1-4C acyl, 1-4C alkylsulphinyl, 1-4C alkylsulphonyl, Ar, OAr or Het), 3-7C cycloalkyl or 5-7C cycloalkenyl (both opt. substd. by 1 or more halo or 1-3 CN, halo, 1-4C alkyl, 1-4C haloalkyl, 1-4C alkoxy(1-4C) alkyl, 1-4C haloalkoxy, 1-4C alkoxy, 1-4C alkylthio, 1-4C alkoxy-carbonyl, 3-7C cycloalkyl, 5-7C cycloalkenyl, Ar, OAr or Het), or aryl-(1-4C)alkyl ((opt. opt. mono-, di- or trisubstd. by CN, NO2, halo, 1-4C alkyl (opt. substd. by halo or 1-4C alkoxy), 1-4C alkoxy, 1-4C haloalkoxy, 1-4C alkylthio, 1-4C alkoxy-carbonyl, 1-4C acyl, Ar, OAr or Het). Compounds (I) are new, with provisos.