Acta Agrestia Sinica ›› 2015, Vol. 23 ›› Issue (2): 414-421.DOI: 10.11733/j.issn.1007-0435.2015.02.030

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Pathogenicity of Entomopathogenic Nematodes to Grass Grubs (Coleoptera: Scarabaeidae)

QIAN Xiu-juan, LIU Chang-zhong, RUAN Yan-e   

  1. Pratacultural College of Gansu Agricultural University, Lanzhou, Gansu Province 730070, China
  • Received:2014-05-06 Revised:2014-08-14 Online:2015-04-15 Published:2015-03-25

昆虫病原线虫对甘肃省草地蛴螬的致病力研究

钱秀娟, 刘长仲, 阮艳娥   

  1. 甘肃农业大学草业学院, 甘肃 兰州 730070
  • 通讯作者: 刘长仲
  • 作者简介:钱秀娟(1980-),女,甘肃武威人,讲师,博士研究生,主要从事害虫生物防治研究,E-mail:qianxj@gsau.edu.cn
  • 基金资助:

    甘肃省农业生物技术研究与应用开发项目(GNSW-2013-18)资助

Abstract:

28 indigenous isolates of entomopathogenic nematodes from Gansu were used in a series of bioassays against grassland grubs(Holotrichia oblita Fald and Melolntha hippocastanica Menetries). All isolates showed infectivity to H.diomphalia, especially Steinernema feltiae 0619HT and Heterorhabditis megidis 0627M. In pot experiments,S.feltiae 0619HT killed the host within a short time and H.megidis 0627M caused greater mortality as time goes on. The optimal does of EPN in assay against H.oblita was 3200 IJs·H-1. Similar results were observed in field experiments after applying nematode for 2 weeks, the revision reduced rates of Melolntha hippocastanica after applying S. feltiae 0619HT and H. megidis 0627M in field were 83.8% and 79.5%, respectively. These results overall suggest S. feltiae 0619HT and H. megidis 0627M to be promising biocontrol agents against grass grubs.

Key words: Entomopathogenic nematodes, Grass grubs, Assay, Infectivity, Control efficacy

摘要:

为提高昆虫病原线虫在草地蛴螬(Scarabaeidae)防治中的应用,以甘肃省采样诱集的28个线虫品系为研究对象,通过实验室致病力测定研究了昆虫病原线虫对草地蛴螬的致病力.结果表明:Steinernema feltiae 0619HT和Heterorhabditis megidis 0627M 2品系对草地蛴螬有较高的致病力.S.feltiae 0619HT品系对华北大黑鳃金龟(Holotrichia oblita)致死时间较短,而H.megidis 0627M品系的累积致病力较强,室内测定昆虫病原线虫侵染草地蛴螬的适合剂量为3200 IJs·H-1.天然草场施用S.feltiae 0619HT和H.megidis 0627M线虫2周后,大栗鳃金龟(Melolntha hippocastanica)虫口减退率分别为83.8%和79.5%.故S. feltiae 0619HT和H. megidis 0627M线虫品系对甘肃省草地蛴螬具有较高的防治效果,是一种有效的生防因子.

关键词: 昆虫病原线虫, 草地蛴螬, 室内生测, 致病力, 防治效果

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