Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Toxicity Evaluation of 'Bt-Plus' on Parasitoid and Predatory Natural Enemies

기생성 및 포식성 천적에 대한 작물보호제 '비티플러스'의 독성 평가

  • Received : 2012.01.06
  • Accepted : 2012.02.06
  • Published : 2012.03.01
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Abstract

Effect of a new crop protectant 'Bt-Plus' on natural enemies was analyzed in this study. Tested natural enemies included two parasitic species of $Aphidius$ $colemani$ and $Eretmocerus$ $eremicus$, and four predatory species of $Harmonia$ $axyridis$, $Orius$ $laevigatus$, $Amblyseius$ $swirskii$, and $Phytoseiulus$ $persimilis$. 'Bt-Plus' was formulated by combination of three entomopathogenic bacteria ($Xenorhabdus$ $nematophila$ (Xn), $Photorhabdus$ $temperata$ subsp. $temperata$ (Ptt), $Bacillus$ $thuringiensis$ (Bt)) and bacterial metabolite (BM). All three types of 'Bt-Plus' showed significantly higher toxicities against fourth instar $Plutella$ $xylostella$ larvae than Bt single treatment. Two types of bacterial mixtures ('Xn+Bt' and 'Ptt+Bt') showed little toxicity to all natural enemies in both contact and oral feeding assays. However, 'BM+Bt' showed significant toxicities especially to two predatory mites of $A.$ $swirskii$ and $P.$ $persimilis$. The acaricidal effects of different bacterial metabolites were evaluated against two spotted spider mite, $Tetranychus$ $urticae$. All six BM chemicals showed significant acaricidal effects. The BM mixture used to prepare 'Bt-Plus' showed a high acaricidal activity with a median lethal concentration at 218.7 ppm (95% confidence interval: 163.2 - 262.3). These toxic effects of bacterial metabolites were also proved by cytotoxicity test against Sf9 cells. Especially, benzylideneacetone, which was used as a main ingredient of 'BM+Bt', showed high cytotoxicity at its low micromolar concentration.

신작물보호제로 개발된 '비티플러스'의 천적에 대한 영향평가가 이뤄졌다. 분석된 천적은 두 종의 기생성 천적인 콜레마니진디벌($Aphidius$ $colemani$) 및 황온좀벌($Eretmocerus$ $eremicus$)과 네 종의 포식성 천적인 무당벌레($Harmonia$ $axyridis$), 애꽃노린재($Orius$ $laevigatus$), 지중해이리 응애($Amblyseius$ $swirskii$) 및 칠레이리응애($Phytoseiulus$ $persimilis$)를 포함했다. '비티플러스'는 세 가지 곤충병원세균($Xenorhabdus$ $nematophila$(Xn), $Photorhabdus$ $temperata$ subsp. $temperata$(Ptt), $Bacillus$ $thuringiensis$(Bt))과 세균 대사물질(BM)을 조합하여 개발되었다. 배추좀나방($Plutella$ $xylostella$) 4령충에 대해서 세 종류의 '비티플러스'('Xn+Bt', 'Ptt+Bt' 그리고 'BM+Bt') 모두는 Bt 단독에 비해 높은 살충력을 나타냈다. '비티플러스'의 천적에 대한 영향에서 세균배양액 혼합체('Xn+Bt' 또는 'Ptt+Bt')는 접촉독성 및 섭식독성 분석에서 모두 독성이 낮은 것으로 나타났다. 그러나 'BM+Bt'는 일부 독성을 보였으며, 특별히 지중해이리응애와 칠레이리응애에 대해서 높은 독성을 나타냈다. 이들 세균대사물질의 살비효과를 점박이응애($Tetranychus$ $urticae$)를 대상으로 분석하였다. 각 대사물질별로 상이한 살비력을 보인 가운데, '비티플러스'에 이용된 대사물질 복합체는 반수치사약량이 218.7 ppm(95% 신뢰구간: 163.2 - 262.3)으로 비교적 높은 살비효과를 나타냈다. 이들 물질의 독성은 Sf9 세포주에 대한 세포독성 분석을 통해 나타났다. 특별히 'BM+Bt' 제조에 사용된 주성분인 벤질리덴아세톤은 낮은 농도에서도 높은 세포독성을 보였다.

Keywords

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