Effect of Diclofopmethyl Alone and in Combination with Other Herbicides on Weed Control in Wheat

Field experiments during 1993–94 and 1994–95 were dominated by natural infestation of wild oal. Isoproturon applied alone @ 750 g ha⁻¹ did not control wild oat, while diclofopmethyl applied alone @ 1000 g ha⁻¹ was not effective against lambs quarter. Tank mixtures of herbicides were less effective than sequential treatments of broad-leaved herbicides with diclofopmethyl in reducing the population and dry weight of grassy and broad-leaved weeds. For lambsquarter control, tribenufon @ 7.5 or 2,4-D @ 250 g ha⁻¹ used as tank mixture or follow up treatments proved more useful than fluoroxypyr applied @ 200 g ha⁻¹. Presence of weeds for the entire crop season reduced the grain yield of wheat by 49%.