Tabari Mohaddeseh Abouhosseini, Youssefi Mohammad Reza, Esfandiari Aryan, Benelli Giovanni
Faculty of Veterinary Medicine, Amol University of Special Modern Technologies, Amol, Iran.
Department of Veterinary Parasitology, Babol Branch, Islamic Azad University, Babol, Iran.
Res Vet Sci. 2017 Oct;114:36-40. doi: 10.1016/j.rvsc.2017.03.001. Epub 2017 Mar 6.
Insect vectors are responsible for spreading devastating parasites and pathogens. A large number of botanicals have been suggested for eco-friendly control programs against mosquito vectors, and some of them are aromatic plants. Pelargonium roseum, a species belonging to the Geraniaceae family, due to its pleasant rose-like odor may represent a suitable candidate as mosquito repellent and/or larvicide. In this research, we evaluated the toxicity of the essential oil from P. roseum and its major constituents against the West Nile and filariasis vector Culex pipiens. The chemical composition of P. roseum essential oil was analyzed by gas chromatography-mass spectroscopy. Major constituents were citronellol (35.9%), geraniol (18.5%), and linalool (5.72%). The bioactivity of P. roseum essential oil and its three major compounds on larvae and egg rafts of Cx. pipiens was evaluated. The essential oil had a significant toxic effect on larvae and egg rafts of Cx. pipiens, with 50% lethal concentration (LC) values of 5.49 and 0.45μg/mL, respectively. Major constituents, geraniol, citronellol and linalool resulted in LC values of 6.86, 7.64 and 14.87μg/mL on larvae, and 0.8, 0.67 and 1.27μg/mL on egg rafts. Essential oil and two of its constituents, citronellol and geraniol showed moderate knock-down on Cx. pipiens adults. Overall, the present investigation revealed that the major components of P. roseum and specially the whole essential oil could be helpful in developing novel and safe mosquito control tools and also offer an environmentally safe and cheap tool for reducing Cx. pipiens mosquito populations.
昆虫媒介是传播毁灭性寄生虫和病原体的罪魁祸首。大量植物提取物已被提议用于针对蚊虫媒介的生态友好型控制计划，其中一些是芳香植物。香叶天竺葵是牻牛儿苗科的一个物种，因其具有宜人的玫瑰般气味，可能是一种合适的驱蚊剂和/或杀幼虫剂候选物。在本研究中，我们评估了香叶天竺葵精油及其主要成分对西尼罗河和丝虫病媒介致倦库蚊的毒性。通过气相色谱-质谱联用仪分析了香叶天竺葵精油的化学成分。主要成分是香茅醇（35.9%）、香叶醇（18.5%）和芳樟醇（5.72%）。评估了香叶天竺葵精油及其三种主要化合物对致倦库蚊幼虫和卵块的生物活性。该精油对致倦库蚊幼虫和卵块具有显著毒性作用，50%致死浓度（LC）值分别为5.49和0.45μg/mL。主要成分香叶醇、香茅醇和芳樟醇对幼虫的LC值分别为6.86、7.64和14.87μg/mL，对卵块的LC值分别为0.8、0.67和1.27μg/mL。精油及其两种成分香茅醇和香叶醇对致倦库蚊成虫表现出中等程度的击倒作用。总体而言，本研究表明香叶天竺葵的主要成分，特别是整个精油，有助于开发新型安全的蚊虫控制工具，也为减少致倦库蚊种群提供了一种环境安全且廉价的工具。
