Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Repellent and Acaricidal Activities against Leptotrombidium pallidum Larvae of Eucalyptus Oil

털진드기 유충에 대한 유칼립투스 오일의 기피 및 살비활성

  • Jo, Hyeong-Chan (Department of Rehabilitation Welfare, College of Health & Welfare, Woosuk University) ;
  • Kim, Kwang-Ho (Agricultural Biology Department, National Institute of Agricultural Science and Technology, RDA) ;
  • Lee, Sang-Guei (Agricultural Biology Department, National Institute of Agricultural Science and Technology, RDA) ;
  • Na, Young-Eun (Agricultural Biology Department, National Institute of Agricultural Science and Technology, RDA) ;
  • Park, Hyung-Man (Agricultural Biology Department, National Institute of Agricultural Science and Technology, RDA)
  • 조형찬 (우석대학교 보건복지대학) ;
  • 김광호 (농촌진흥청 농업과학기술원) ;
  • 이상계 (농촌진흥청 농업과학기술원) ;
  • 나영은 (농촌진흥청 농업과학기술원) ;
  • 박형만 (농촌진흥청 농업과학기술원)
  • Published : 2008.09.30
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Abstract

Repellent and acaricidal activities of eucalyptus oil, permethrin, and DEET against Leptotrombidium pallidum larvae, which are a vector transmitting tsutsugamushi disease, were evaluated under laboratory conditions using a filter paper impregnated method. The $LD_{50}$ values of eucalyptus oil and DEET were 0.025 and 0.018 $mg/cm^2$, respectively while that of permethrin was higher than 0.2 $mg/cm^2$. In the repellency test of these materials at 6.14 $mg/cm^2$, eucalyptus oil gave complete repellency, and the larvae crossed the treated zone killed. But permethrin showed 60% repellency at 9.20 $mg/cm^2$ and the mites croosed the zone were not killed. The percent repellency of DEET at 0.53 $mg/cm^2$ was 8.3 and 2.8 times higher than that of permethrin and eucalyptus oil, respectively. The acaricidal activities of emulsifiable concentrates-pump sprayers containing the eucalyptus oil as an active ingredient were assayed. The emulsifiable concentrates containing 1% and 3% eucalyptus oil showed weak mortality at 1 hour after treatment, while all ones containing more than 6% oil produced 100% activity against L. pallidum larvae. The mortality also increased as exposure time to the concentrates increase. These results suggest that the potential of eucalyptus oil highly expected to be used as a control or repellent agent against L. pallidum larvae may be very high.

쯔쯔가무시병을 매개하는 털진드기 유충을 대상으로 유칼립투스 정유, 퍼메스린 그리고 DEET의 기피력과 살비력을 실내에서 여지흡수법을 이용하여 확인하였다. 털진드기 유충에 대한 이들 물질들의 반수치사량($LD_{50}$)은 유칼립투스 정유와 DEET는 각각 0.025와 0.018 $mg/cm^2$로 우수한 살비력을 보였으며, 퍼메스린의 경우는 조사한 최고 농도 수준인 0.2 $mg/cm^2$이상인 것으로 나타났다. 또한 이들 물질을 6.14 $mg/cm^2$으로 처리한 기피력 시험에서 유칼립투스 정유는 100% 기피력을 보였고, 그 처리된 지역에 들어온 개체들은 완전히 벗어나지 못하고 치사하였다. 그러나 퍼메스린의 경우는 가장 높은 시험농도 수준(9.20 $mg/cm^2$)에서도 처리 지역을 통과한 개체들이 생존하였고, 기피력도 60% 정도로 낮게 나타났다. DEET는 1.53 $mg/cm^2$처리 수준에서 퍼메스린에 비해 8.3배, 유칼립투스 정유에 대해서는 2.8배 더 강하게 나타났다. 털진드기 유충에 대한 기피력은 DEET,유칼립투스 정유 그리고 퍼메스린 순이었다. 또 다른 실험에서는 털진드기 유충에 대한 천연 유칼립투스 정유를 유효성분으로 함유한 유제의 살비력이 평가되었다. 60분 간의 노출 시간 동안 1%와 3% 유제는 강한 살비력을 나타내지 못한 반면, 6% 이상의 유제들은 일정 시간이 지나면서 100%의 살비력을 보였다. 이와 같이 털진드기 유충들의 시험 유제들에 대한 반응은 유칼립투스 정유의 함유량 및 노출 시간 모두에 의존적이었다. 이상의 결과로 유칼립투스 정유는 털진드기 유충에 대한 천연 방제제 또는 기피제로서 활용될 수 있는 여지가 높음을 알 수 있었다.

Keywords

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