In order to screen effective herbicides to fenoxaprop-P-resistant grasses,whole-plant dose response experiments were conducted in greenhouses,and the resistance of Beckmannia syzigachne (sensitive population Sw,resistant population Rw),Alopecurus japonicus (Sr,Rr) and Sclerochloa kengiana (Sy,Ry) to fenoxaprop-P-ethyl were evaluated,and the three resistant weed species were also used to study the biological activities of eight kinds of herbicides.The results showed that all the resistant populations of the three grass species had evolved high resistance to fenoxaprop-P-ethyl,and the resistance indexes were greater than 33.7.The three resistant populations had evolved high resistance to ACCase inhibitors pinoxaden and clodinafop-propargyl (the resistance index were 11.6-56.5),but low resistance to some ALS herbicides (the resistance index were 2.0-4.8),while flucarbazone-Na displayed poor control effect to the resistant populations,with a GRg0 from 67.31 to 114.39 g (a.i.)/ hm2;pyroxsulam could control the Rr population effectively,and the GR90 was 4.67 g (a.i.)/hm2;mesosulfuron-methyl showed high efficacy against the three resistant populations,but there was risk of resistance in Rr population,with a resistance index of 2.0;sulfosulfuron could well control Ry and Rr populations,while propoxycarbazone-sodium showed high efficacy in controlling Rr population.Flufenacet was the only herbicide that had ideal effects to all Rw,Rr and Ry populations with a control efficacy of more than 90％ at the recommended field rate with 120 g (a.i.)/hm2.
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维普
万方数据
