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Control efficacy of BtPlus against two mosquitoes, Aedes koreicus and Culex vagans

한국숲모기와 줄다리집모기에 대한 비티플러스 방제 효과

  • Kim, Yonggyun (Department of Plant Medicals, College of Life Sciences, Andong National University) ;
  • Minoo, Sajjadian (Department of Plant Medicals, College of Life Sciences, Andong National University) ;
  • Ahmed, Shabbir (Department of Plant Medicals, College of Life Sciences, Andong National University)
  • Received : 2020.02.03
  • Accepted : 2020.02.13
  • Published : 2020.03.01

Abstract

Two mosquito species were collected in still-water near farming area in Andong, Korea. Based on morphological characters, these two mosquitoes were identified as Aedes koreicus and Culex vagans, respectively. DNA barcode analyses supported the identification. An entomopathogenic bacterium, Bacillus thuringiensis subsp. israelensis (BtI), exhibited insecticidal activities against the two mosquito species and its virulence was more potent than that of B. thuringiensis subsp. kurstaki. It has been known that the bacterial metabolites of Xenorhabdus spp. suppress insect immunity and enhance pathogenicity of B. thuringiensis. This study tested the effect of the bacterial culture broth of Xenorhabdus spp. on enhancing BtI pathogenicity. Among three Xenorhabdus spp., culture broth of X. ehlersii (Xe) was relatively effective to enhance BtI pathogenicity against both mosquito species. Indeed, organic extracts of Xe culture broth suppressed the hemocyte-spreading behavior, suggesting the presence of immunosuppressant in the culture broth. These results suggest a formulation of BtPlus by mixing BtI spore and Xe culture broth to be applied to control the two mosquito species.

안동지역 농가 주변의 정수에서 두 종의 모기가 채집되었다. 형태적 특징을 바탕으로 이들이 한국숲모기(Aedes koreicus)와 줄다리집모기(Culex vagans)로 각각 동정되었다. 또한, DNA 바코드 서열을 분석한 결과 이러한 동정 결과를 뒷받침하였다. 이들 모기류 유충에 대해 곤충병원세균인 Bacillus thuringiensis subsp. israelensis (BtI)가 살충효과를 보였으며 유사한 B. thuringiensis subsp. kurstaki에 비해 우수하였다. 한편 곤충의 면역억제를 유발하여 B. thuringiensis의 병원력을 높인다고 알려진 Xenorhabdus 세균류의 배양액을 BtI에 첨가하여 이들 모기류에 대한 살충력 증가 효과 유무를 확인하였다. 분석에 이용된 3 종류의 Xenorhabdus 세균배양액 가운데 X. ehlersii (Xe)의 배양액이 비교적 다른 세균배양액에 비해 두 종의 모기류에 대해서 BtI의 살충력을 높이는 것으로 나타났다. 이를 바탕으로 Xe 세균배양액으로부터 유기용매 추출물의 생물활성을 분석한 결과 모기의 혈구 활착행동을 뚜렷이 억제시키는 면역억제자가 존재한다는 것을 확인하였다. 본 연구는 BtI와 Xe의 두 세균을 혼합한 비티플러스 미생물제제가 한국숲모기와 줄다리집모기의 방제에 효과적이라는 것을 제시한다.

Keywords

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