A compound, composition, and method for controlling Take-all disease of plants by applying to the seed prior to planting, a fungicide of the formula: ##STR1## wherein Z.sub.1 and Z.sub.2 are C and are part of an aromatic ring which is pyridine; R and n are defined herein; A is selected from the group consisting of --C(O)--SR.sub.3, --NH--C(X)R.sub.4, --C(.dbd.NR.sub.3)--XR.sub.7, and --C(X)-amine wherein the amine is substituted with with an alkylaminocarbonyl and a hydrogen or wherein the amine has a first and a second amine substituent defined herein; B is --W.sub.m --Q(R.sub.2).sub.3 or selected from 0-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 may also be selected from --N(R.sub.3).sub.m H(.sub.1-m)--, --S(O)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.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; or wherein two R.sub.2 groups may be combined to form a cyclo group with Q which is 1-methylcyclopropyl, 1-methylcyclobutyl, 1-methylcyclopentyl, or 1-methylcyclohexyl; R.sub.3 is C.sub.1 -C.sub.4 alkyl; R.sub.4 is C.sub.1 -C.sub.4 alkyl, haloalkyl, alkoxy, alkylthio, alkylamino, or dialkylamino; and R.sub.7 is C.sub.1 -C.sub.4 alkyl, haloalkyl, or phenyl, optionally substituted with halo, nitro, or R.sub.4 ; or an agronomic salt thereof.