Substituted 2,6-substituted 1,2- or 1,6-dihydro pyridine compounds

A herbicidal composition containing as an active ingredient a compound represented by the formula ##STR14## wherein:

• one of Y.sub.1 and Y.sub.2 is ##STR15## in which Z.sub.1 is selected from ##STR16## where R, R.sub.4 and R.sub.5 are the same or different and are selected from lower alkyl, lower alkenyl, lower alkynyl, lower haloalkyl, lower haloalkenyl, and lower cyanoalkyl, and ##STR17## is selected from azetidinyl and a saturated or unsaturated 5-membered heterocyclic ring moiety containing 1-2 nitrogen atoms, the remaining atoms being carbon atoms, optionally substituted with 1 to 3 groups which are the same or different and are selected from lower akyl, lower alkoxy, cyano, halo, nitro, lower haloalkyl, lower alkoxy-lower alkyl and di(lower alkoxy)-lower alkyl;
• the other of Y.sub.1 and Y.sub.2 is ##STR18## is as defined above;
• R.sub.1 and R.sub.2 are independently selected from fluorinated methyl, chlorofluorinated methyl, chlorinated methyl, and lower alkyl radicals, provided that one of R.sub.1 and R.sub.2 must be a fluorinated methyl or chlorofluorinated methyl radical;
• X is selected from lower alkyl, lower (cycloalkyl)lower alkyl, lower alkoxy-lower alkyl, lower alkylthio-lower alkyl and cyclobutyl.

A method for control of undesired vegetation which comprises applying to the plant locus a compound represented by the formula ##STR20## wherein:

• one of Y.sub.1 and Y.sub.2 is ##STR21## in which Z.sub.1 is selected from ##STR22## where R, R.sub.4 and R.sub.5 are the same or different and are selected from lower alkyl, lower alkenyl, lower alkynyl, lower haloalkyl, lower haloalkenyl, and lower cyanoalkyl, and ##STR23## is selected from azetidinyl and a saturated or unsaturated 5-membered heterocyclic ring moiety containing 1-2 nitrogen atoms, the remaining atoms being carbon atoms, optionally substituted with 1 to 3 groups which are the same or different and are selected from lower alkyl, lower alkoxy, cyano, halo, nitro, lower haloalkyl, lower alkoxy-lower alkyl and di(lower alkoxy)-lower alkyl;
• Z is selected from O and S;
• the other of Y.sub.1 and Y.sub.2 is ##STR24## is as defined above;
• R.sub.1 and R.sub.2 are independently selected from fluorinated methyl, chlorofluorinated methyl, chlorinated methyl, and lower alkyl radicals, provided that one of R.sub.1 and R.sub.2 must be a fluorinated methyl or chlorofluorinated methyl radical;
• X is selected from lower alkyl, lower alkoxy-lower alkyl, lower alkylthio-lowralkyl and cyclobutyl.