河南农业科学 ›› 2021, Vol. 50 ›› Issue (7): 101-109.DOI: 10.15933/j.cnki.1004-3268.2021.07.012

• 植物保护 • 上一篇    下一篇

烟草镰刀菌根腐病病原菌的鉴定及其对5 种杀菌剂的敏感性分析

刘利佳1,李芳芳2,何雷2,彭玉富3,丁永乐1,孙聚涛1   

  1. (1. 河南农业大学烟草学院,河南郑州450002;2. 河南省烟草公司,河南郑州450000;3. 河南中烟工业有限责任公司技术中心,河南郑州450000)
  • 收稿日期:2021-02-01 出版日期:2021-07-15 发布日期:2021-07-15
  • 通讯作者: 孙聚涛(1985-),男,河北石家庄人,讲师,博士,主要从事烟草抗病育种研究。E-mail:1sjt@163.com
  • 作者简介:刘利佳(1995-),女,河南郑州人,在读硕士研究生,研究方向:烟草抗病育种。E-mail:llj951010@163.com
  • 基金资助:
    中国烟草总公司河南省烟草公司重大专项(2018410000270035)

Pathogen Identification of Tobbaco Fusarium Root Rot and Its Sensitivity to Five Fungicides

LIU Lijia1,LI Fangfang2,HE Lei2,PENG Yufu3,DING Yongle1,SUN Jutao1   

  1. (1.College of Tobacco Science,Henan Agricultural University,Zhengzhou 450002,China;2.Henan Tobacco Company,Zhengzhou 450000,China;3.Technology Center,Henan China Tobacco Industry Co.,Ltd.,Zhengzhou 450000,China)
  • Received:2021-02-01 Published:2021-07-15 Online:2021-07-15

摘要: 为筛选防治烟草镰刀菌根腐病的有效农药,降低该病害对烟叶产量和质量的影响,采用显微观察、进化树分析以及接种鉴定的方法,对从河南省襄城县烟草镰刀菌根腐病发病烟株根部分离出的病原菌NC-11进行形态学鉴定、分子鉴定及致病性鉴定,并选用5种杀菌剂对其进行毒力测定,对其中抑菌效果最好的杀菌剂进行田间防效验证。结果表明,从烟草镰刀菌根腐病发病烟株根部分离出的病原菌NC-11为尖孢镰刀菌(Fusarium oxysporium)。供试5种杀菌剂对NC-11菌丝生长的抑制作用存在显著差异,以62.5 g/L精甲·咯菌腈悬浮种衣剂的抑制效果最好,其EC50为0.186 2 mg/L,对病原菌的菌丝生长抑制率最高可达97.27%;68%精甲霜·锰锌水分散粒剂的抑制效果最差,其EC50为203.152 2 mg/L,质量浓度为1 000.00 mg/L时对病原菌的菌丝生长抑制率最高为66.53%。田间验证结果表明,62.5 g/L精甲·咯菌腈悬浮种衣剂在首次施药46 d后相对防效达72.69%。因此,可将62.5 g/L精甲·咯菌腈悬浮种衣剂作为防治烟草镰刀菌根腐病的首选药剂。

关键词: 烟草, 镰刀菌根腐病, 杀菌剂, 敏感性, 防治效果

Abstract: In order to screen out effective pesticides for the control of tobacco Fusarium root rot,and reduce the impact of the disease on the yield and quality of tobacco leaves,the methods of microscopic observation,evolutionary tree analysis,and inoculation identification were used to conduct biological identification,molecular identification and pathogenicity identification of the pathogen NC⁃11 isolated from the roots of tobacco Fusarium root rot plants in Xiangcheng County,Henan Province. Five fungicides were selected for virulence test,and the best fungicide among them was tested for field control effect. The results showed that the pathogen NC⁃11 isolated from the roots of tobacco plants with Fusarium root rot disease was Fusarium oxysporum. There were significant differences in the inhibitory effects of the five tested fungicides on the mycelial growth of Fusarium oxysporium. The inhibitory effect of metalaxyl⁃M·fludioxonil 62.5 g/L FSC was the best,its EC50 was 0.186 2 mg/L,and the inhibition rate on mycelial growth was up to 97.27%;Famoxadone·mancozeb 68% WG had the worst inhibitory effect,its EC50 was 203.152 2 mg/L,when the mass concentration was 1 000.00 mg/L,the inhibition rate on mycelial growth was only 66.53%. Field verification results showed that 46 days after the first application in the field,the relative control effect of metalaxyl⁃M·fludioxonil 62.5 g/L FSC reached 72.69%.Therefore,metalaxyl⁃M·fludioxonil 62.5 g/L FSC can be used as the first choice for the prevention and control of tobacco Fusarium root rot.

Key words: Tobacco, Fusarium root rot, Fungicide, Sensitivity, Control efficacy

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