Compounds of Formula I, and their N-oxides and agriculturally-suitable salts, are disclosed which are useful for controlling undesired vegetation ##STR1## wherein: ##STR2## T is O or S; W is a single bond, O, S or NR.sup.6 ; X is N or CH; Y is N or CH; Z is N or CR.sup.7 provided that when Z is CR.sup.7, then Y is N; R.sup.6 is H, CH.sub.3 or OCH.sub.3 ; m is 1 or 2; and R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, and R.sup.7 are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula I and a method for controlling undesired vegetation which involves contacting the vegetation or its environment with an effective amount of a compound of Formula I.
Compounds of formula (D having herbicidal utility are disclosed; ##STR1## wherein Q is a variety of heteroaromatic groups; X is a single bond; O; S; or NR.sup.4 ; R.sup.1 is C.sub.1 -C.sub.5 alkyl optionally substituted with C.sub.1 -C.sub.2 alkoxy, OH, 1-3 halogens, or C.sub.1 -C.sub.2 alkylthio; CH.sub.2 (C.sub.3 -C.sub.4 cycloalkyl); C.sub.3 -C.sub.4 cycloalkyl optionally substituted with 1-3 methyl groups; C.sub.2 -C.sub.4 alkenyl; or C.sub.2 -C.sub.4 haloalkenyl; R.sup.2 is H; chlorine; bromine; C.sub.1 -C.sub.2 alkyl; C.sub.1 -C.sub.2 alkoxy; C.sub.1 -C.sub.2 alkylthio; C.sub.2 -C.sub.3 alkoxyalkyl; C.sub.1 -C.sub.2 alkylthioalkyl; cyano; nitro; NH(C.sub.1 -C.sub.2 alkyl); or N(C.sub.1 -C.sub.2 alkyl).sub.2 ; R.sup.4 is H; CH.sub.3 ; or OCH.sub.3 ; and agriculturally suitable salts thereof.