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Sensitivity assessment of Phytophthora nicotianae to fungicides of fluazinam and its mixture with carboxylic acid amide

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烟草科技 2018年第A1期51卷 1-7页

作者： MU Wenjun LI Qi CHEN Xiuhua LI Haijiang DONG Kunle WANG Jianwei ZHANG Youwu FENG Xiaohu ZHANG Zhigao WANG Libing SONG Jizhen Key Laboratory of Eco-environment and Leaf Tobacco Quality Zhengzhou Tobacco Research Instilule of CNTC. No.2 Fengyang Street Zhengzhou 450001China Henan Tobacco Company No. 7 Zhengqi Street Zhengzhou 450008 China Pingdingshan Branch of Henan Provincial Tobacco Company No.263 Jianshe Road Pingdingshan 467000 Henan China Luoyang Branch of Henan Provincial Tobacco Company No.246 Kaiyuan Avenue Luoyang 471026Henan China Fuzhou Branch of Jiangxi Provincial Tobacco Company No. 1666 Yingbin Avenue Fuzhou 344000 Jiangxi China

Tobacco black shank caused by Phytophthora parasitica ***(Breda de Hean)is one of the most serious diseases in tobacco growing,and few effective fungicides are available *** purpose of this study was to assess the feasibility of using fluazinam to treat tobacco black shank *** vitro toxicities of fluazinam to 62 isolates of *** were determined by mycelial growth rate *** EC50 values ranged from 0.294 6 to 2.389 9 μg/mL with a mean of 1.084 0 μg/*** sensitivity distribution was unimodal,and there was no resistant isolate in *** *** carboxylic acid amide(CAA)fungicides were single-site in action and activity to *** synergistic interactions were tested by Wadley method between fluazinam and dimethomorph,flumorph,mandipropamid,*** mixture containing dimethomoph:Huazinam at 1:2 ratio showed additive actions,with the synergy ratio of *** mixture containing flumorph and fluazinam at 1:5 ratio had the highest synergy ratio(SR 2.07).mandipropamid and fluazinam had an additive interaction and the proportion of 2:1 had the lowest EC50 value(0.020 7 μg/mL).This study demonstrated the sensitivity of *** to fluazinam,and provided the experimental foundation to use fluazinam for tobacco black shank management.

关键词： Phytophthora nicotianae Fluazinam Dimethomorph Flumorph mandipropamid Fungicide mixture

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