Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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An Integrated Biological Control Using an Endoparasitoid Wasp (Cotesia plutellae) and a Microbial Insecticide (Bacillus thuringiensis) against the Diamondback Moth, Plutella xylostella

배추좀나방에 대한 프루텔고치벌과 미생물농약의 통합생물방제

  • Kim, Kyusoon (Major in Plant Medicals, School of Bioresource Sciences, Andong National University) ;
  • Kim, Hyun (Major in Plant Medicals, School of Bioresource Sciences, Andong National University) ;
  • Park, Young-Uk (Department of Plant Medicine, Chungbook National University) ;
  • Kim, Gil-Hah (Department of Plant Medicine, Chungbook National University) ;
  • Kim, Yonggyun (Major in Plant Medicals, School of Bioresource Sciences, Andong National University)
  • 김규순 (안동대학교 생명자원과학부 식물의학전공) ;
  • 김현 (안동대학교 생명자원과학부 식물의학전공) ;
  • 박영욱 (충북대학교 식물의학과) ;
  • 김길하 (충북대학교 식물의학과) ;
  • 김용균 (안동대학교 생명자원과학부 식물의학전공)
  • Received : 2012.11.30
  • Accepted : 2013.01.28
  • Published : 2013.03.01
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Abstract

All tested Korean populations of the diamondback moth, Plutella xylostella, are known to be resistant especially against pyrethroid insecticides by mutation in its molecular target, para-sodium channel. Moreover, P. xylostella is able to develop resistance against most commercial insecticides. This study was performed to develop an efficient control technique against P. xylostella by a combined treatment of an endoparasitoid wasp, Cotesia plutellae, and a microbial insecticide, Bacillus thuringiensis. To investigate any parasitism preference of C. plutellae against susceptible and resistant P. xylostella, five different populations of P. xylostella were compared in insecticide susceptibilities and parasitism by C. plutellae. These five P. xylostella populations showed a significant variation against three commercial insecticides including pyrethroid, organophosphate, neonicotinoid, and insect growth regulator. However, there were no significant differences among five P. xylostella populations in their parasitic rates by C. plutellae. Moreover, parasitized larvae of P. xylostella showed significantly higher susceptibility to B. thuringiensis. As an immunosuppressive agent, viral ankyrin genes (vankyrins) encoded in C. plutellae were transiently expressed in nonparasitized larvae. Expression of vankyrins significantly enhanced the efficacy of B. thuringiensis against the third instar larvae of P. xylostella. Thus an immunosuppression induced by C. plutellae enhanced the insecticidal efficacy of B. thuringiensis. These results suggest that a combined treatment of C. plutellae and B. thuringiensis may effectively control the insecticide-resistant populations of P. xylostella.

국내 배추좀나방(Plutella xylostella) 집단은 피레스로이드 농약에 대해서 저항성을 보이며, 이는 이 살충제의 작용점인 소듐이온채널 유전자의 돌연변이에 기인된다. 더욱이 배추좀나방은 대부분 상용화된 살충제에 대해서 저항성을 발달시킬 수 있다. 본 연구는 배추좀나방을 효과적으로 방제하기 위해 내부기생성 천적인 프루텔고치벌(Cotesia plutellae)과 미생물농약인 Bacillus thuringiensis의 혼합처리 기술을 개발하기 위해 수행되었다. 프루텔고치벌이 감수성과 저항성 배추좀나방에 대한 기생 선호성에 차등이 있는 지 조사하기 위해 다섯 개 서로 다른 집단에 대해서 살충제 감수성과 프루텔고치벌 기생성 차이를 비교하였다. 이들 배추좀나방 집단들은 피레스로이드, 유기인계, 네오니코틴계 및 곤충성장조절제를 포함하는 세 종류의 상용 살충제에 대한 약제 감수성에서 뚜렷한 차이를 보였다. 그러나 이들 집단들은 프루텔고치벌에 의한 기생률에서는 차이를 보이지 않았다. 더욱이 기생된 배추좀나방은 B. thuringiensis에 대해서 감수성이 증가되었다. 프루텔고치벌이 갖는 면역억제인자 가운데 바이러스 유래 ankyrin 유전자(vankyrin)를 비기생된 배추좀나방에 발현시켰다. Vankyrin의 발현은 배추좀나방 3령충의 B. thuringiensis에 대한 감수성을 현격하게 증가시켰다. 즉, 프루텔고치벌에 의해 야기된 면역저하가 B. thuringiensis의 살충력을 증가시켰다. 이러한 결과들은 프루텔고치벌과 미생물농약인 B. thuringiensis의 혼합처리가 살충제 저항성 배추좀나방을 효과적으로 방제할 수 있다고 제시하고 있다.

Keywords

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