Department of Plant Production Technology, Faculty of Agricultural Technology, King Mongkut's Institute of Technology Ladkrabang, Ladkrabang, Bangkok, 10520, Thailand.
Sci Rep. 2021 Feb 25;11(1):4685. doi: 10.1038/s41598-021-84159-z.
Improved natural adulticidal agents against mosquito vectors are in urgent need, and essential oils from Cinnamomum plants can assume this role quite readily. Cinnamomum verum, C. cassia, and C. loureiroi essential oils (EOs) were extracted from the barks and evaluated for their chemical composition by GC-MS. The major constituent of the three EOs was cinnamaldehyde. WHO susceptibility tests on individual and combined EOs as well as cinnamaldehyde were conducted against female adults of Aedes aegypti and Aedes albopictus. All EO combinations exhibited a synergistic effect, manifesting a higher toxicity, with a synergistic value ranging from 2.9 to 6.7. Their increasing mortality value was improved between 16.0 to 41.7%. The highest synergistic effect was achieved by an EO combination of 0.5% C. cassia + 0.5% C. loureiroi, while the highest insecticidal activity was achieved by 2.5% C. verum + 2.5% C. cassia and 1% cinnamaldehyde, with a knockdown and mortality rate of 100% and a KT between 0.7 and 2.1 min. This combination was more toxic to both mosquito species than 1% w/v cypermethrin. These findings demonstrate that cinnamaldehyde and synergistic combinations of C. verum + C. cassia EOs and C. cassia + C. loureiroi EOs have a high insecticidal efficacy against Aedes populations.
需要改进针对蚊虫媒介的天然杀成虫剂，肉桂植物精油可以很好地发挥这一作用。从肉桂树的树皮中提取了肉桂（Cinnamomum verum）、中国肉桂（C. cassia）和柳叶肉桂（C. loureiroi）精油（EO），并通过 GC-MS 对其化学成分进行了评估。三种 EO 的主要成分均为肉桂醛。对单个和混合 EO 以及肉桂醛对埃及伊蚊和白纹伊蚊雌成虫进行了 WHO 敏感性测试。所有 EO 组合均表现出协同作用，表现出更高的毒性，协同值范围为 2.9 至 6.7。它们的致死率提高了 16.0%至 41.7%。协同作用最强的是 0.5%中国肉桂+0.5%柳叶肉桂的 EO 组合，而 2.5%肉桂+2.5%中国肉桂和 1%肉桂醛的杀虫活性最高，击倒和死亡率均为 100%，KT 值在 0.7 至 2.1 分钟之间。与 1% w/v 氯菊酯相比，这种组合对两种蚊子的毒性都更强。这些发现表明，肉桂醛和肉桂（C. verum）+中国肉桂（C. cassia）EO 混合物以及中国肉桂（C. cassia）+柳叶肉桂（C. loureiroi）EO 混合物具有很高的杀虫功效，可有效防治埃及伊蚊和白纹伊蚊。
