BROADLEAF WEED-CONTROL AND CABBAGE SEED YIELD FOLLOWING HERBICIDE APPLICATION

Broadleaf weed control with trifluralin, oxyfluorfen, pendimethalin, c lopyralid, pyridate, and metolachlor in cabbage (Brassica oleracea L,) grown for seed was evaluated, No single herbicide controlled broadlea f weeds adequately, with the exception of pendimethalin at 1.92 and 3. 84 kg a.i/ha, However, combinations of trifluralin + oxyfluorfen, pend imethalin + clopyralid, and oxyfluorfen + pyridate effectively control led weeds and did not reduce seed yields. Herbicides caused slight to moderate injury symptoms to cabbage plants, with the greatest injury c aused by pendimethalin and the least by trifluralin and metolachlor. H owever, plants recovered from these symptoms and appeared normal at th e bud stage. None of the herbicides applied alone or in combinations a dversely affected cabbage population, height, or flowering date. Chemi cal names used: 3,6-dichloro-2-pyridinecarboxylic acid (clopyralid); m ethylphenyl)-N-(2-methoxy-1-methylethyl)acetamide (metolachlor); 2-chl oro-1-(3-ethoxy-4-nitrophenoxy) -4-(trifluoromethyl) benzene (oxyfluor fen); 1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine (pendimethali n); loro-3-phenyl-4-pyridazin-yl)S-octylcarbonothioate (pyridate); ini tro-N,N-dipropyl-4-(trifluoromethyl)benzemanine (trifluralin).