Different herbicides were tested for effective weed control in a seed crop of onion at Punjab Agricultural University Ludhiana, during 1975–76 and 1976–77. Oxadiazon (2.00 and 3.00 kg a.i./ha post-emergence), fluchloralin (0.90 and 1.20 kg a.i./ha pre-plant), fluchloralin + chloroxuron (1.20 + 1.50 kg a.i./ha pre-plant and pre-emergence, respectively) and fluchloralin + propanil (1.20 + 0.68 kg a.i./ha pre-plant and post-emergence, respectively) proved to be the most promising treatments controlling the weed population and leading to significantly higher seed yields. No residual effect of any of the herbicides was observed on succeeding crops of okra, bottlegourd, squashmelon and muskmelon.