Evaluation of the effectiveness of different herbicides against a new weed Japanese brome (Bromus japonicus Houtt.) in wheat crop

A field experiment was conducted to evaluate the efficacy of different post emergence herbicides for the control of monocot weed the Japanese broom (Bromus japonicus ) in wheat crop. Five herbicides viz., metribuzin, isoproturon, metribuzin plus isoproturon, Atlantis and sulfosulfuron were used at their recommended doses in RCBD with three replications. The weedy check was kept as control where no herbicide was sprayed. All the herbicides were applied as post-emergence after second irrigation at 60 days after sowing the crop. The lowest weed counts per m2 (0.583) and highest percent of weed mortality (99.07%) were observed where metribuzin plus isoproturon was used. This was followed by Atlantis with 3.26 weeds per m2 with 95.14% mortality of weeds. However, significantly higher 1000 grain weight was noted with Atlantis (29.50 g) and metribuzin plus isoproturon (28.58 g). The treatments did not differ significantly with respect to 1000 grain weight. All the herbicide helped to increase the yield from 16 to 22%, but did not differ significantly with respect to yield gain. The highest yield (3759.40 kg ha-1) was produced by Atlantis followed by sulfosulfuron (3757.20 kg ha-1 ). On the basis of cost benefit ratio sulfosulfuron (34.95) proved to be the best followed by metribuzin (16.78). Therefore, sulfosulfuron and metribuzin are recommended for the control of Bromus weed in wheat crop.