Efficiency Comparison between Sulfosulfuron (Apyrus) and Sulfosulfuron+Metsulfuron-Methyl (Total) in Wild Barley (Hordeum spontaneum C. Koch.) Control and Their Effect on Wheat Yield

Wild barley (Hordeum spontaneum) is one of the most troublesome weed species in wheat (Triticum aestivum) in Iran. In order to compare the efficacy of sulfosulfuron, sulfosulfuron+metsulfuron-methyl as the two sulfonylurea herbicides on wild barley control in relation with growth stages of wild barley, an experiment was conducted. It was based on RCBD with 3 replications in Marvdasht, Fars Province in 2010. The treatments included sulfosulfuron trade form as Apyrus® (30 g/ha-1+surfactant) and sulfosulfuron+metsulfuron-methyl trade form as Total® (45 g/ha-1+1250 ml surfactant) in 2-4 leaf, second node and 2-4 leaf+second node of wild barley and control (untreated). The results showed that Total® herbicide had better efficacy to control wild barley in comparison with Apyrus® so that by using Total in the second node and 2-4 leaf+second node density decreased to 0 (score 1). The application of herbicide Apyrus® in the second node and 2-4 leaf +second node stage of wild barley were low in quantity of wild barley efficient density and dry weight (score 5), respectively. Total® efficacy was high in 2-4 leaf stage compared to Apyrus® with decreasing 90.78% and 95.55% density and dry weight of wild barley, respectively.