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中国生物防治学报 ›› 2019, Vol. 35 ›› Issue (1): 70-74.DOI: 10.16409/j.cnki.2095-039x.2019.01.007

• 研究论文 • 上一篇    下一篇

双委夜蛾高致病力球孢白僵菌的筛选及在玉米内定殖率的测定

孙艺昕1,2, 门兴元2, 李超2, 于毅2, 夏小菊2, 吕素洪2, 叶保华1, 李丽莉2   

  1. 1. 山东农业大学植物保护学院, 泰安 271018;
    2. 山东省农业科学院植物保护研究所/山东省植物病毒学重点实验室, 济南250100
  • 收稿日期:2018-07-26 出版日期:2019-02-08 发布日期:2019-01-31
  • 通讯作者: 叶保华,副教授,E-mail:baohua@sdau.edu.cn;李丽莉,副研究员,E-mail:zbsli3@163.com。
  • 作者简介:孙艺昕,硕士研究生,E-mail:18763826038@163.com
  • 基金资助:
    国家重点研发计划(2018YFD0200603);山东省重点产业关键技术(2016CYJS03A01-4);山东省重大应用技术创新项目(CXGC2016A09,CXGC2016A11)

Screening of High Pathogenicity Strains of Beauveria bassiana against Athetis dissimilis and Detection of Colonization Rate in Maize

SUN Yixin1,2, MEN Xingyuan2, LI Chao2, YU Yi2, XIA Xiaoju2, LÜ Suhong2, YE Baohua1, LI Lili2   

  1. 1. College of Plant Protection, Shandong Agricultural University, Taian 271018, China;
    2. Key Laboratory for Plant Virology of Shandong, Shandong Academy of Agricultural Sciences, Jinan 250100, China
  • Received:2018-07-26 Online:2019-02-08 Published:2019-01-31

摘要: 双委夜蛾Athetis dissimilis(Hampson)为近年新发生的农业害虫,具有隐蔽为害的习性。为探索有效可持续的防治方法,实验室内测定了YB8、TB1126、YB12、TB1349和YB15共5株球孢白僵菌菌株对双委夜蛾2龄幼虫的致病力,筛选出高致病力白僵菌菌株,并测定其在玉米植株中的定殖率。结果表明:不同菌株对双委夜蛾的致病力存在较大的差异,LT50分别为1.35、2.16、2.61、1.68和2.16 d,LC50分别为9.09×107、5.00×108、5.54×109、1.41×1011和2.61×1012孢子/mL。菌株YB8在26℃下,产孢量1.094×107个/mL,孢子萌发率89.66%,1×109孢子/mL 10 d时双委夜蛾2龄幼虫死亡率达到100%,感染僵死率达到86.67%,在玉米根中定殖率为44.44%,茎中定殖率为51.59%,叶片中定殖率为36.30%。具有较大的开发潜力。

关键词: 双委夜蛾, 球孢白僵菌, 菌株筛选, 植物内生菌

Abstract: Athetis dissimilis (Hampson) is a cryptic insect pest emerging as a serious agricultural pest in recent years. To explore effective and sustainable control of the pest, the pathogenicity of 5 isolates (YB8, TB1126, YB12, TB1349, YB15) of the entomopathogenic fungus Beauveria bassiana to 2nd instar larvae of A. dissimilis was tested under laboratory condition to screen for high pathogenicity strains, and the colonization rate of YB8 in maize was measured. The isolates showed significant differences in pathogenicity to the A. dissimilis larvae, with median lethal times (LT50) of 1.35, 2.16, 2.61, 1.68, and 2.16 d, respectively, and median lethal concentrations (LC50) of 9.09×107, 5.00×108, 5.54×109, 1.41×1011, and 2.61×1012 conidia/mL, respectively. At 26℃, conidial production of YB8 reached 1.094×107, of which 89.66% germinated. When YB8 was applied at 1×109 conidia/mL, the accumulative mortality of A. dissimilis 2nd instars reached 100%, resulting in cadaver rate of 86.67% at 10 d post application. The colonization rate of YB8 was 44.44% in maize root, 51.59% in stem, and 36.30% in leaf. These results show that the strain YB8 is potential for further exploitation.

Key words: Athetis dissimilis, Beauveria bassiana, strain screening, endophytic

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