3-Pyridinecarboxylic acid, 2-(4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl)-5-ethyl- plus 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamine Imazaquin plus trifluralin Tri-Scept US5683000