Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
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Control Efficacy of Entomopathogenic Microagent against Spodoptera exigua on Organic Chinese Cabbage

유기재배 배추포장 내 파밤나방에 대한 곤충병원성 미생물의 방제 효과

  • 박종호 (국립농업과학원 유기농업과) ;
  • 홍성준 (국립농업과학원 유기농업과) ;
  • 한은정 (국립농업과학원 유기농업과) ;
  • 심창기 (국립농업과학원 유기농업과) ;
  • 김민정 (국립농업과학원 유기농업과) ;
  • 김용기 (국립농업과학원 유기농업과)
  • Received : 2015.09.03
  • Accepted : 2015.10.26
  • Published : 2015.12.31
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Abstract

This study was carried out to identify the control effect of entomopathogenic microagent against Spodoptera exigua on organic chinese cabbage. In laboratory condition, insecticidal activity of 4 commercial BT pesticides against S. exigua were lower than 10% against second instar S. exigua. The insecticidal activity of entomopathogenic nematode were 33.3%, 83.3% and 100% at the concentration of $1{\times}10^2$, $3{\times}10^2$, $1{\times}10^3nematodes/ml$, respectively. Mixture of BT and nematode showed growth inhibition against S. exigua larvae. S. exigua nucleopolyhedrovirus (SeNPV) of $10^5PIBs/ml$ showed more than 70% insecticial activity. The yield of SeNPV was increased as in higher initial inoculation concentration of NPV, food supply, and growth temperature increased. In greenhouse experiment, the control value of BT and nematode mixture treatment was higher than BT and nematode treatment alone against S. exigua. In treatment of $10^7PIBs/ml$ of SeNPV, S. exigua was controlled completely. In farm condition, mixture of microbial agent and organic agricultural material showed higher control value against lepidopteran pest including S. exigua than BT single treatment.

곤충병원성 미생물을 이용한 배추 파밤나방을 방제하기 위한 시험을 실시한 결과, 실내 실험의 경우 시중에 판매되는 4종의 비티제는 그 파밤나방 유충에 대해 10% 이하의 살충 효과를 보여주었다. 곤충병원성 선충의 경우 파밤나방에 대해 $1{\times}10^2$, $3{\times}10^2$, $1{\times}10^3$ 마리/ml에서 살충효과가 각각 33.3, 83.3, 100%로 나타났다. 비티와 곤충병원성 선충의 혼합처리에 의한 파밤나방 유충의 발육억제 효과가 크게 나타났다. 파밤나방핵다각체 바이러스(SeNPV)는 $10^5$ 다각체/ml의 농도에서 70% 이상의 높은 살충효과를 보여주었다. SeNPV 생산량은 초기접종농도, 사료 공급량 및 사육온도가 높을수록 증가하였다. 온실시험에서는 비티와 선충 혼합처리가 단독처리보다 파밤나방에 방제효과가 높았으며 SeNPV는 $10^7$ 다각체/ml에서 100% 방제효과를 보여주었다. 유기배추재배 포장에서는 미생물제와 유기농업자재 혼합처리에서 파밤나방을 비롯한 나방류해충 발생이 무처리구나 비티단독처리구 보다 낮게 나타났다.

Keywords

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