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《Chinese Agricultural Science Bulletin》 2008-05
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Resistance to Metalaxyl of Phytophthora infestans and Cross-resistance of Metalaxyl with Cymoxanil and Propamocarb

Yang Zhihui1,Gui Xiumei1,Zhu Jiehua1,Zhang Fengguo1,Ding Hongtian2,Ding Lili3(1Department of Plant Pathology,Agricultural University of Hebei,Control Centre of P1ant Pathogens and P1ant Pests of Hebei Province,Baoding 071001; 2Animal Health Supervision Institute of Hebei Province,Shijiazhuang 050081; 3Institute of Genetics and Physiology,Hebei Academy of Agricultural Sciences,Shijiazhuang 050051)  
【OBJECTIVE】The resistance to metalaxyl of Phytophthora infestans was assessed in the four provinces of main potato production and cross-resistances of metalaxyl with propamocarb and cymoxanil were also examined;【METHOD】The resistance to metalaxyl of P.infestans was assessed by an in vitro radical growth assay on fungicide-amended media and cross-resistances of metalaxyl with propamocarb and cymoxanil were estimated through comparison of virulence of three fungicides;【RESULTS】Metalaxyl-resistant isolates generally occurred in three provinces of Sichuan,Hebei and Heilongjiang provinces except Yunnan and the frequencies of metalaxyl-resistant strains were 16.7%,24.0% and 100% in Sichuan,Hebei and Heilongjiang provinces,respectively.Tests of virulence of three fungicides shown that virulences of cymoxanil to metalaxyl-resistant and sensitive isolates were very high and virulences of propamocarb to these two kinds of isolates were very low,which indicating cross-resistances of metalaxyl with propamocarb and cymoxanil did not exist;【CONCLUSION】Metalaxyl-resistant isolates of P.infestans generally occurred in China.Cymoxanil could substitute metalaxyl for controlling potato late blight because it was highly virulent to P.infestans and did not exist cross-resistances with metalaxyl.
【Fund】: 河北省自然科学基金资助项目(C2007000463)
【CateGory Index】: S435.32
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