A method of controlling Take-all disease of plants by applying, preferably to the seed prior to planting, a fungicide of the formula ##STR1## wherein Z.sub.1 and Z.sub.2 are C or N and are part of an aromatic ring selected from benzene, pyridine, thiophene, furan, pyrrole, pyrazole, thiazole, and isothiazole; A is selected from --C(X)-amine, --C(O)--SR.sub.3, --NH--C(X)R.sub.4, and --C(.dbd.NR.sub.3)--XR.sub.7 ; B is --W.sub.m --Q(R.sub.2).sub.3 or selected from o-tolyl, 1-naphthyl, 2-naphthyl, and 9-phenanthryl, each optionally substituted with halogen or R.sub.4 ; Q is C, Si, Ge, or Sn; W is --C(R.sub.3).sub.p H.sub.(2-p) --; or when Q is C, W is selected from --C(R.sub.3).sub.p H.sub.(2-p) --, --N(R.sub.3).sub.m H.sub.(1-m) --, --S(O).sub.p --, and --O--; X is O or S; n is 0, 1, 2, or 3; m is 0 or 1; p is 0, 1, or 2; each R is independently selected from a) halo, formyl, cyano, amino, nitro, thiocyanato, isothiocyanato, trimethylsilyl, and hydroxy; b) C1-C4 alkyl, alkenyl, alkynyl, C3-C6 cycloalkyl, and cycloalkenyl, each optionally substituted with halo, hydroxy, thio, amino, nitro, cyano, formyl, phenyl, C1-C4 alkoxy, alkylcarbonyl, alkylthio, alkylamino, dialkylamino, alkoxycarbonyl, (alkylthio)carbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylsulfinyl, or alkylsulfonyl; c) phenyl, furyl, thienyl, pyrrolyl, each optionally substituted with halo, formyl, cyano, amino, nitro, C1-C4 alkyl, alkenyl, alkynyl, alkoxy, alkylthio, alkylamino, dialkylamino, haloalkyl, and haloalkenyl; d) C1-C4 alkoxy, alkenoxy, alkynoxy, C3-C6 cycloalkyloxy, cycloalkenyloxy, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylamino, dialkylamino, alkylcarbonylamino, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylcarbonyl, alkylcarbonyloxy, alkoxycarbonyl, (alkylthio)carbonyl, phenylcarbonylamino, phenylamino, each optionally substituted with halo; wherein two R groups may be combined to form a fused ring; each R.sub.2 is independently selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl and phenyl, each optionally substituted with R.sub.4 or halogen; and wherein, when Q is C, R.sub.2 may also be selected from halo, alkoxy, alkylthio, alkylamino, and dialkylamino; wherein two R.sub.2 groups may be combined to form a cyclo group with Q; R.sub.3 is C1-C4 alkyl; R.sub.4 is C1-C4 alkyl, haloalkyl, alkoxy, alkylthio, alkylamino, or dialkylamino; and R.sub.7 is C1-C4 alkyl, haloalkyl, or phenyl, optionally substituted with halo, nitro, or R.sub.4 ; or an agronomic salt thereof.

Un método de controlar Tomar-toda enfermedad de plantas aplicándose, preferiblemente a la semilla antes de plantar, un fungicida del ## del ## STR1 del fórmula en donde Z.sub.1 y Z.sub.2 son C o N y son parte de un anillo aromático seleccionado del benceno, pyridine, thiophene, furan, pyrrole, pyrazole, thiazole, e isothiazole; A se selecciona -- C(X)-amina, -- de C(O) -- SR.sub.3, -- NH -- C(X)R.sub.4, y -- C(.dbd.NR.sub.3) -- XR.sub.7; B es -- W.sub.m -- Q(R.sub.2).sub.3 o seleccionado de o-tolyl, 1-naphthyl, 2-naphthyl, y 9-phenanthryl, cada uno substituido opcionalmente con el halógeno o R.sub.4; Q es C, silicio, GE, o sn; W es -- el --; de C(R.sub.3).sub.p H.sub.(2-p) o cuando Q es C, W se selecciona de -- C(R.sub.3).sub.p H.sub.(2-p) --. -- N(R.sub.3).sub.m H.sub.(1-m) --. -- S(O).sub.p --. y el --; X del --O es O o S; n es 0, 1, 2, o 3; m es 0 o 1; p es 0, 1, o 2; cada R se selecciona independientemente a) de halo, del formyl, de cyano, de amino, de nitro, thiocyanato, isothiocyanato, trimethylsilyl, y hydroxy; b) El alkyl C1-C4, el alkenyl, el alkynyl, el cycloalkyl C3-C6, y el cycloalkenyl, cada uno substituyeron opcionalmente con el halo, hydroxy, thio, amino, nitro, cyano, formyl, fenilo, C1-C4 alkoxy, alkylcarbonyl, alkylthio, alkylamino, dialkylamino, alkoxycarbonyl, (alkylthio)carbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylsulfinyl, o alkylsulfonyl; c) fenilo, furyl, thienyl, pyrrolyl, cada uno substituyó opcionalmente con halo, formyl, cyano, amino, nitro, el alkyl C1-C4, alkenyl, alkynyl, alkoxy, alkylthio, alkylamino, dialkylamino, haloalkyl, y haloalkenyl; d) C1-C4 alkoxy, alkenoxy, alkynoxy, C3-C6 cycloalkyloxy, cycloalkenyloxy, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylamino, dialkylamino, alkylcarbonylamino, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylcarbonyl, alkylcarbonyloxy, alkoxycarbonyl, (el alkylthio)carbonyl, phenylcarbonylamino, phenylamino, cada uno substituyó opcionalmente con halo; en donde dos grupos de R se pueden combinar para formar un anillo fundido; cada R.sub.2 se selecciona independientemente del alkyl, del alkenyl, del alkynyl, del cycloalkyl, del cycloalkenyl y de fenilo, cada uno substituidos opcionalmente con R.sub.4 o halógeno; y en donde, cuando Q es C, R.sub.2 se puede también seleccionar de halo, alkoxy, de alkylthio, de alkylamino, y de dialkylamino; en donde dos grupos R.sub.2 se pueden combinar para formar a un grupo del cyclo con Q; R.sub.3 es el alkyl C1-C4; R.sub.4 es el alkyl C1-C4, haloalkyl, alkoxy, alkylthio, alkylamino, o dialkylamino; y R.sub.7 es el alkyl C1-C4, haloalkyl, o fenilo, substituido opcionalmente con halo, nitro, o R.sub.4; o una sal agronómica de eso.