Resistance of paddy Echinochloa crus-galli to cyhalofop-butyl and herbicide screening in Heilongjiang Province
[Aims]These experiments were designed to study the resistance level of Echinochloa crus-galli to cyhalofop-butyl in Heilongjiang Province,and identify the potential rotational herbicides.[Methods]The single-dose method and whole-plant bioassay were used to detected the resistance levels of 33 populations of E.crus-galli,and the cross and multiple resistance to other frequently used herbicides.[Results]The results of single-dose method showed that except HL33 from wasteland,relative fresh weigh of the other 32 populations were greater than 25％,which could be inferred as suspected resistant populations.The results of resistance showed that 3 populations showed high level of resistance with RI＞10,accounting for 33％;4 populations with RI ranged from 5.28 to 9.96,showed medium level of resistance,accounting for 44％;2 populations showed low level resistance with RI＜5,and the frequency was 22％.The results of correlation analysis of biological activity showed that cyhalofop-butyl had an extremely strong correlation with metamifop,propanil and quinclorac,it had a stong correlation with penoxsulam,while it had a weak correlation with pyribenzoxim.[Conclusions]E.crus-galli in Heilongjiang Province has developed a general resistance to cyhalofop-butyl,which showed cross and multiple resistance to several frequently-used herbicides in rice the fields.Pyribenzoxim can be used as a suitable rotation agent.
万方数据
维普
