Chemical weed management programs for cycloxydim-tolerant maize in Iran

n order to introduce new chemical weed management program in maizeweed control in Iran,a study was conducted during 2014 and 2015.Experiment werecarried out in a randomized complete block design with three replications.15 treatments of the common maize herbicides, includingnicosulfuron, foramsulforon, eradicane and 2,4-D+MCPA were applied in their recommended doses,moreover the treatments related to cycloxydim with dicamba+ tritosulfuron were usedwith different doses and in different timesalong withtwo control treatments (weedy and weed-free). Treatments contained 75-150 g a.i. ha-1of cycloxydim,showed similar results with the common treatments including nicosulfuron, foramsulforon, eradicane and 2,4-D + MCPA.However, treatments with high doses ofcycloxydim,had a significant reduction in weed densityand weedbiomass.There were no significant differences between the effects of treatments on maizegrainyield and biomass.Despite the acceptable weed control of the combined treatment of cycloxydim with dicambaplustritosulfuron,maize canopy could overcome weed growth.Based on the results and by considering cycloxydim efficacy in controlling perennial grassy weeds in maize plantation, this chemical is a suitable optionduring different growing stages of weeds and maize. Finally,the application of200-300 g a.i. ha-1of cycloxydim combined with dicambaplustritosulfuron was the best optionfrom an economic and environmentalsafety points of view.