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

밀양산 콩포장 담배거세미나방 유충의 약제에 대한 감수성

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

Abstract

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.

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