• Journal of the Korean Wood Science and Technology
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• 제52권2호
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• pp.134-144
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• 2024

This study aimed to analyze the anti-termite properties of tamanu (Calophyllum inophyllum L.) stem bark extracts against subterranean termites, specifically, Coptotermes curvignathus. The bark powder of C. inophyllum was extracted using different solvents, such as n-hexane, ethyl acetate, and methanol, using the maceration method. Anti-termite testing was performed using two paper disc methods: no- and two-choice tests. Whatman test paper was dripped with the extract solutions at concentrations of 4%, 6%, 8%, and 10% (w/v). Subsequently, the treated paper disc was placed into an acrylic tube, and the subterranean termite was added. The parameters utilized in the test included termite mortality and the weight loss of the test paper. The results revealed that the total extract yield of C. inophyllum stem bark was 30.24%. Furthermore, the extractive substances from C. inophyllum bark exhibited anti-termite activity. The most favorable outcomes were obtained with the n-hexane and ethyl acetate extracts at a concentration of 10%. The termite mortality and weight loss of the test paper were respectively 66% and 5.67% for the n-hexane extract and 66.67% and 6.19% for the ethyl acetate extract. In addition, the n-hexane extract contained friedelan-3-one, while the ethyl acetate extract contained 1,2-benzene dicarboxylic acid, dinonyl ester, and friedelan-3-one. The results suggested that these compounds are responsible for the observed anti-termite activity.

• 한국유기농업학회지
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• 제24권4호
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• pp.821-831
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• 2016

본 연구는 난방제 해충인 파밤나방을 농가에서 효과적으로 방제하기 위해 Bacillus thuringiensis와 고삼추출물 혼합처리에 의한 살충효과를 실내 포트 및 포장 실험을 통해 조사하였다. 실내 포트 실험에서 BT를 농도별($1{\times}10^5$, $1{\times}10^6$, $1{\times}10^7cfu\;mL^{-1}$)로 처리하였을 때 파밤나방의 살충율은 27.5%, 51.3%, 92.5%로 농도가 높아질수록 살충율이 증가하였다. BT ($1{\times}10^5$, $1{\times}10^6$, $1{\times}10^7cfu\;mL^{-1}$)와 0.033% 고삼추출물 혼합처리구의 살충율은 98.8%, 88.8%, 91.3%로 BT 단독처리보다 BT+고삼추출물 혼합처리구가 높은 살충율을 나타냈으며, 혼합된 BT의 농도가 낮을수록 살충율 증가가 높았다. 각 처리별 파밤나방의 식이저해 효과는 BT의 농도가 높아질수록 우수한 것을 확인하였다. 또한 포장 실험에서도 실내포트 실험과 유사하게 BT 단독처리구(14.4%, 26.7%, 66.7%)보다 고삼추출물 혼합처리구가 높은 살충율(72.2%, 67.8%, 61.1%)을 나타냈으며 식이저해효과 또한 실내실험과 유사한 결과를 나타냈다. 따라서 농가에서 파밤나방을 효과적으로 방제하기 위해서는 BT 단독처리보다 0.033% 고삼과 BT($1{\times}10^5cfu/ml$)를 혼합하여 처리하는 것이 효과적일 것으로 사료된다.