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Determination of Economic Injury Levels and Control Thresholds for Spodoptera exigua on Chinese Cabbage

배추 파밤나방의 경제적 피해수준 및 요방제 수준 설정

  • Kim, Seon-Gon (Jeonnam Agricultural Research and Extension Services) ;
  • Kim, Do-Ik (Jeonnam Agricultural Research and Extension Services) ;
  • Ko, Suk-Ju (Jeonnam Agricultural Research and Extension Services) ;
  • Kang, Beom-Ryong (Jeonnam Agricultural Research and Extension Services) ;
  • Kim, Hong-Jae (Jeonnam Agricultural Research and Extension Services) ;
  • Choi, Kyeong-Ju (On-spot Extension Division, Rural Development Administration)
  • 김선곤 (전라남도농업기술원 친환경연구소) ;
  • 김도익 (전라남도농업기술원 친환경연구소) ;
  • 고숙주 (전라남도농업기술원 친환경연구소) ;
  • 강범용 (전라남도농업기술원 친환경연구소) ;
  • 김홍재 (전라남도농업기술원 친환경연구소) ;
  • 최경주 (농촌진흥청 현장기술지원과)
  • Published : 2009.03.30

Abstract

Economic injury level and control thresholds for the management of beet army worm, Spodoptera exigua (Lepidoptera: Noctuidae) were evaluated on chinese cabbage of two different planting time. Two inoculation times were tested for each planting and the number of inoculated larva was 10, 20, 40, 80, respectively. Damages of leaves by first inoculation were 63.2% after eight days planting on 80 larva inoculation plot. By the second inoculation, those were below 50% after 20 days planting on the end of September. The linear relationships between population density and yield reduction were as following; Y = -10.62x + 867.9 ($R^2\;=\;0.643$) for 5 days and Y=-6.432x + 1074 ($R^2\;=\;0.720$) for 20 days. Based on these results the economic injury level was 5.4 larva for five days and 9.0 larva for 20 days per 20 chinese cabbage. The control thresholds calculated by 80% level of economic injury level were 4.3 and 7.2 larva, respectively.

배추에서 파밤나방의 경제적피해수준과 요방제수준을 설정하기 위해 시험한 결과, 파밤나방의 접종시기별 피해엽율은 정식 5일째(1차 접종)에 20주에 80마리 접종시 8일만에 63.2%의 피해엽율로 가장 높았으며, 정식 20일째에 접종(2차 접종)한 경우 10일째에 80마리 접종구에서 40.7%, 14일째에 43.1%로 증가하다 이후 감소하였다. 배추 파밤나방의 유충밀도와 수량감소율과의 관계는 정식 5일은 Y = -10.62x + 867.9 ($R^2\;=\;0.643$), 정식 20일에는 Y=-6.432x + 1074 ($R^2\;=\;0.720$)이며, 경제적 피해수준은 5.4마리, 9.0마리이며, 5% 수준에서 요방제 밀도는 각각 4.3마리, 7.2마리였다. 배추생육 시기 및 파밤나방 접종밀도에 따른 피해율과 수량감소율의 관계는 정의 상관을 나타내어 배추의 수량에는 파밤나방의 초기 피해가 크게 작용한 것으로 판단되었다.

Keywords

References

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