Efficacy of dicamba alone and in combination with isoproturon on wheat (Triticum aestivum) and associated weeds

Effect of dicamba alone and in combination with isoproturon on wheat (Triticum aestivum L. emend. Fiori & Paol.) and associated weeds was evaluated in a field experiment conducted during winter seasons of 1999- 2000 and 2000-01. Phalaris minor, Melilotus sp., Coronopus didymus and Medicago denticulata were the major weeds in the experimental field. Post-emergence application of dicamba alone at 250, 500, 1,000 glha and in combination with isoproturon at 150+1,000, 200+1,000 and 250+1,000 glha as well as with 2,4-D at 125+500 gl ha provided excellent control of broad-leaved weeds. Dicamba had no effect on /? minor population. All the weed-control treatments significantly increased the grain yield of wheat over weedy check. Maximum grain yield of wheat (50 qlha) was recorded under dicamba at 200 glha as tank-mix application with isoproturon at 1.0 kglha compared with the rest of the treatments except dicamba 250 glha as tank-mix application with isoproturon.