한국응용곤충학회지 (Korean journal of applied entomology)

  • 제42권3호
  • /
  • Pages.225-231
  • /
  • 2003
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  • 1225-0171(pISSN)
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  • 2287-545X(eISSN)
한국응용곤충학회 (Korean Society of Applied Entomology)
권호 표지

밀양산 콩포장 담배거세미나방 유충의 약제에 대한 감수성

Insecticide Susceptibility in the Different Larva of Tobacco Cutworm, Spodoptera litural Fabricius (Lepidoptera: Noctuidae) Collected in the Soybean Fields of Milyang, Korea

  • 배순도 (영남농업시험장 식물환경과) ;
  • 최병렬 (농업과학기술원 작물보호부 농업해충과) ;
  • 송유한 (경상대학교 농업생명과학연구원) ;
  • 김현주 (영남농업시험장 식물환경과)
  • 발행 : 2003.09.01
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초록

밀양에서 채집한 담배거세미나방 유충의 약제감수성을 조사하였다. 약제의 반수치 사농도는 1령층에서 0.5-5.6ppm,2령층에서 9.9-27.9ppm, 3령층에서 9.6-125.1ppm 및 4령층에서 24.3-546.6ppm으로 약종에 따른 차이와 함께 유충의 영기가 증가할수록 높았다. 또한 약제별 추천농도에 대한 유충의 90%치사농도의 비로 나타낸 약제내성비(내성비=$LC_{90}$ 약제별 추천농도)도 1령충에서 0.04-0.8, 2령충에서 0.2-7.5, 3령충에서 0.7-115.3및 4령충 에서 1.2-483.4으로 약종에 따른 차이와 함께 유충의 영기가 증가할수록 높았다. 한편,동일 약제에서 유충의 영기간 반수치사농도, 및 내성비의 차이는 chlorfenapyr, chlorpyrifos 및 EPN에서 매우 낮았으며, lufenuron, chlorfluazuron및 teflubenzuron에서 매우 높았다. 이러한 결과를 종합하면 담배거세미나방 유충의 방제는 영기가 어릴수록 또한 약제감수성이 낮은 약제, 즉 반수치사농도 및 내성비의 차이가 적은 약제인 chlorfenapyr, chlorpyrifos 및 EPN을 사용할수록 효과적임을 의미한다.

The susceptibility of the different larval stages of Spodoptera litura to nine insecticides was evaluated using the perilla leaf-dipping method. Median lethal concentration ($LC_{50}$) was increased with larval development in the range of 0.5 ppm to 5.6 ppm, 9.9 ppm to 27.9 ppm, 9.6 ppm to 125.1 ppm and 24.3 ppm to 546.6 ppm in the 1st, 2nd, 3rd and 4th instar, respectively. The tolerance ratio (TR), which is the TR of 90 percent lethal concentration (LC/ sub 90/) to the recommended concentration, was 0.04 to 0.8 in the 1 st, 0.2 to 7.5 in the 2nd, 0.7 to 115.3 in the 3rd and 1.2 to 485.4 in the 4th instars. Lower D$LC_{50}$ and DTR, which is the difference between the $LC_{50}$ and the TR of 4th and other instars, respectively, were observed in chlorfenapyr, chlorpyrifos and EPN while higher ones were lufenuron, chlorfluazuron and teflubenzuron. These results mean that insecticides with lower D$LC_{50}$ and DTR are effective in controlling larva of S. litura collected in Milyang, Korea.

키워드

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