Study On Resistance And Chemical Controlling Of Alopecurus Japonicus Steud To Fenoxaprop-p-ethyl In Anhui Province

The test materials used in this experiment,the Alopecurus japonicus Steud,was derived from different wheat areas of Anhui Province.The resistance level of Alopecurus japonicus Steud collected from different areas to fenoxaprop-P-ethyl was determined indoor.According to the relative resistance multiple,the resistance level of the Alopecurus japonicus Steud coming from different collection points to fenoxaprop-P-ethyl would be collected to choose the Alopecurus japonicus Steud resistant to fenoxaprop-P-ethyl as the further study materials.We used the whole plant level methods to determine the resistant Alopecurus japonicus Steud,thus eventually find out the resistance level of acetyl-CoA Carboxylase(ACCase)inhibitor herbicide and acetolactate synthase(ALS)inhibitor herbicide respectively.Carrying out field pharmacodynamic test helped to get the control efficiency of single agent of different herbicide against resistant Alopecurus japonicus Steud,and screen out the herbicides with good control effect and moderate cost.After a long-term cycle of compounding agent formula ratio screening test,the best compounding agent ratio were found effective not only in the way of enhancing control effect when put into filed production but in the way of further extending the use cycle of herbicides and delaying the occurrence of weed resistance.1.The study of the resistance level of Alopecurus japonicus Steud from different collection points in Anhui Province wheat areas was carried out indoor by using the whole plant level determination,and the preliminary results showed that the value of GR50 of Alopecurus japonicus Steud collected in the AH-14 area was the lowest-20.66 ga.i./hm2;the value of GR50 of Alopecurus japonicus Steud collected in the AH-26 area was the highest,and its relative resistance multiple was up to 48.69.Therefore,this experiment regarded AH-14 as a sensitive population and AH-26 as a high resistant population.2.Using whole plant method to determine the resistance level of Alopecurus japonicus Steud that had developed resistance or been sensitive to fenoxaprop-P-ethyl indoor,played an important role in the study of the herbicides-resistant level of Alopecurus japonicus Steud to herbicides that had the same or different resistance mechanism.Resistance monitoring results shows that the resistance of the Alopecurus japonicus Steud to six kinds of herbicides that had been longer used in the market went up or down.The order of the resistance level from the study is flufenacet>pinoxaden>mesosulfuron-methyl>clodinafop-propargyl>isoproturon>pyroxsulam.3.In order to achieve the aim of chemical control of wheat paddock where Alopecurus japonicus Steud resistant to fenoxaprop-P-ethyl had been already put into production,this experiment screened out good and effective control agents.Preliminary test used seven kinds of herbicide single agent widely used in the market to act on different target enzymes and the same target enzymes,using resistant Alopecurus japonicus Steud as the control target to conduct pesticide effect test of filed single agent.The results of his study showed the control effect of different herbicides on Alopecurus japonicas Steud:pyroxsulam>isoproturonpinoxaden>mesosulfuron-methyl>flufenacet>clodinafop-propargyl>fenoxaprop-P-ethyl.4.For the sake of enhancing drug effect and reducing the cost of prevention and treatment,this experiment regards resistant Alopecurus japonicus Steud as experiment target and use isoboles to screen out the compounding agent ratio indoor.It can be seen from the results that the optimum dosage ratio of isoproturon and pyroxsulam per hectare was 98:1.