Diaryl ureas herbicides

摘要

N-Aryl-N'-alkyl-N'-arylthio-ureas where R=C1-4 alkyl pref. Me or Et Y=F, Cl, Br or C1-4 alkyl or alkoxy Z=F, Cl, Br or C1-4 alkyl n=0-3 when Y=Hal or 1 when Y=alkyl or alkoxy; Pref. 1 with Y=Cl, Br, Me or MeO, or 2 with Y=Cl or Br a=0-5 when Z=Hal or 1 when alkyl and pref. 0 or 1 when Z=Me or Cl; or 5 when Z=Cl. Y and Z, pref. the same. Pre-and post-emergent herbicides.