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Combination effects of Organic Materials and Bacillus thuringiensis on Spodoptera exigua

유기농자재와 Bacillus thuringiensis의 혼합처리에 의한 파밤나방의 방제효과

  • Han, Ji Hee (Agricultural Microbiology Division, National Academy of Agricultural Science, RDA) ;
  • Yoon, Jihye (Agricultural Microbiology Division, National Academy of Agricultural Science, RDA) ;
  • Son, Sujin (Agricultural Microbiology Division, National Academy of Agricultural Science, RDA) ;
  • Kim, Jeong Jun (Agricultural Microbiology Division, National Academy of Agricultural Science, RDA) ;
  • Lee, SangYeob (Agricultural Microbiology Division, National Academy of Agricultural Science, RDA)
  • 한지희 (농촌진흥청 국립농업과학원 농업미생물과) ;
  • 윤지혜 (농촌진흥청 국립농업과학원 농업미생물과) ;
  • 손수진 (농촌진흥청 국립농업과학원 농업미생물과) ;
  • 김정준 (농촌진흥청 국립농업과학원 농업미생물과) ;
  • 이상엽 (농촌진흥청 국립농업과학원 농업미생물과)
  • Received : 2015.09.11
  • Accepted : 2015.11.02
  • Published : 2015.12.31

Abstract

This study is conduced to investigate control efficacy of mixture of plant extracts which has been reported to control pest and Bacillus thuringiensis or alone. Control efficacy of 0.025% matrine or mixture of 0.016% matrine and BT ($5{\times}10^4cfu$) against $3^{rd}$ instar larvae of beet armyworm were best as 98.7% and 93.3%. Treatment of mixture of 0.01% matrine and BT ($5{\times}10^4cfu$) showed the mortality of 69.3%. In the case of neem, when the mixture of 0.1% neem and BT was applied to larvae of S. exigua, their mortality was 50.0% and weight of larvae were significantly different compare with control and only neem treatment. Therefore For effective control reducing population of beet armyworm and possibility to develop resistance against BT and eco-friendly agents, mixture of 0.016% Matrine and BT ($5{\times}10^4cfu$) could be used.

본 연구는 난방제 해충인 파밤나방을 방제하기 위하여 살충효과가 잘 알려진 유기농자재 5종(님, 고삼, 제충국제, 데리스, 담배잎 추출물)과 이 식물추출물 +Bacillus thuringiensis 혼합 처리에 의한 살충효과를 조사하기 위해 수행되었다. 0.025% Matrine 또는 0.016% Matrine + BT ($5{\times}10^4$, $10^5cfu$) 혼합처리구의 살충율은 98.7, 93.3, 97.3%로 방제효과가 가장 높게 나타났으며, 가장 낮은 처리농도인 0.01% Matrine + BT ($5{\times}10^4cfu$) 혼합처리에서도 69.3%의 살충효과를 보였다. 또한 0.1% Neem + BT ($5{\times}10^6cfu$) 혼합처리에 의한 파밤나방 유충의 살충율은 50.0%이었으며 혼합처리에 의한 유충의 체중감소 효과도 우수하였다. 따라서 파밤나방의 밀도를 줄여주며 BT와 유기농자재에 대한 저항성 발달의 가능성을 낮추어 지속적인 방제를 위해 0.016% Matrine + BT ($5{\times}10^4cfu$) 로 혼합처리 할 경우 파밤나방을 효과적으로 방제할 수 있을 것으로 사료된다.

Keywords

References

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