Abstract:Whole plant dose-response experiments were conducted to evaluate the efficacy of eight herbicides (pyroxsulam, flucarbazone-Na, mesosuifuron-methyl, pinoxaden, clodinafop-propargyl, fenoxaprop-p-ethyl, traloxydim, isoproturon) on eight main grasses (Bromus tectorum L., Sclerochloa dura (L.) Beauv., Beckmannia syzigachne (Steud.) Fern., Avena fatua L., Phleum paniculatum Huds., Alopecurus japonicus Steud., Alopecurus aequalis Sobol., Aegilops tauschii Coss.). The results showed that pyroxsulam, flucarbazone-Na and mesosulfuron-methyl achieved 66.74%-100% control of Bromus tectorum, Alopecurus japonicus and Alopecurus aequalis at the field rate of 14, 22.5 and 9 g/hm2, respectively. However, these herbicides only had slightly effects or no effect to S.dura, Avena fatua, and A.tauschii. In particular, flucarbazone-Na has better control of Beckmannia syzigachne, and pyroxsulam has better control of Phleum paniculatum. Pinoxaden, tralkoxydim, clodinafop-propargyl, fenoxaprop-p-ethyl and isoproturon had high efficacy on A.japonicus, A.aequalis, P.paniculatum, S.dura, B.syzigachne and A.fatua with 71.73%-100% control effect at the field rate. In contrast, these herbicides had inefficient control on A.tauschii and B.tectorum.