Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Control Thresholds for Managing Common Cutworm, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae) on Chinese Cabbage

배추에서 담배거세미나방(Spodoptera litura)의 요방제 수준 설정

  • Choi, Duck-Soo (Jeonnam Agricultural Research and Extension Services) ;
  • Kim, Do-Ik (Jeonnam Agricultural Research and Extension Services) ;
  • Kim, Seon-Gon (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, Sang-Soo (College of Life Science and Natural Resources, Sunchon National University)
  • 최덕수 (전남농업기술원 친환경연구소) ;
  • 김도익 (전남농업기술원 친환경연구소) ;
  • 김선곤 (전남농업기술원 친환경연구소) ;
  • 고숙주 (전남농업기술원 친환경연구소) ;
  • 강범용 (전남농업기술원 친환경연구소) ;
  • 김상수 (순천대학교 생명산업과학대학)
  • Received : 2011.07.04
  • Accepted : 2011.08.04
  • Published : 2011.09.30
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Abstract

This study aimed to estimate control thresholds for managing common cutworm, Spodoptera litura Faricius (Lepidoptera: Noctuidae) at different larval densities and growth stages of Chinese cabbage in field conditions. The percent yield reduction (Y) of Chinese cabbage infested by different densities of S. litura (X, no. of larvae/100 plants) for three weeks were estimated by Y=-21.85X+1300 (R2=0.997) 5 days after transplanting and Y=-12.1X+1382 (R2=0.998) 20 days after transplanting. Based on the relationships between the densities of S. litura larvae and the yield index of chinese cabbage, the number of larvae (2nd to 3rd instar) which caused 5% loss of yield was estimated as 2.9/100 plants 5 days after transplanting, and 5.6/100 plants 20 days after transplanting.

가을재배 배추에서 담배거세미나방 접종시기와 접종밀도에 따라 배추 수량에 미치는 영향을 조사하여 수량감소율에 따른 요방제 수준을 설정하였다. 포장조건에서 담배거세미나방 접종밀도가 다르게 접종하고 3주 동안 배추의 피해엽율을 조사하여 접종밀도와 수량감소율과의 관계식을 산출한 결과, 정식초기(정식 5일 후)는 Y=-21.85X+1300 ($R^2=0.997$)였고, 정식중기(정식 20일 후)는 Y=-12.1X+1382 ($R^2=0.998$)였다. 담배거세미나방 유충밀도와 수량과의 관계식으로 배추 수량 5%를 경감시키는 담배거세미나방 밀도는 정식초기는 2.9마리/100주, 정식중기는 5.6마리/100주 였다.

Keywords

References

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