Compounds of the formula ##STR1## wherein X is halogen or (halo)alkyl; Y and Y.sub.1 are hydrogen, halogen or (halo)alkyl; Z is hydrogen, halogen, (halo)alkyl, (halo)alkoxy, (halo)alkylthio, (halo)alkylsulfinyl, (halo)alkylsulfonyl or amino; with the proviso that at least one of Y, Y.sub.1, and Z is other than hydrogen; and R.sup.1 is alkyl or an optionally substituted cyclopropyl group, are useful as herbicides.