El-Kasem Bosly Hanan Abo
Entomology Biology Department, Faculty of Science, Jazan University, PO Box 2097, Jizan 45142, Saudi Arabia.
Saudi J Biol Sci. 2022 Aug;29(8):103350. doi: 10.1016/j.sjbs.2022.103350. Epub 2022 Jun 16.
mosquitoes are the most widely distributed primary vector of the West Nile virus worldwide. Many attempts for investigation of botanical pesticides to avoid the development of pesticide resistance to conventional synthetic pesticides that are recognized as a threat to the diversity of ecosystems. The study aimed to determine the components of three essential oils of Lamiaceae family, lavender (), peppermint ( L.), and rosemary ( L.) by gas chromatography-mass spectrometry (GC-MS) analysis. Furthermore, aimed to validate the insecticidal activities of these oils as larvicidal agents against the third instar larvae of using five different concentrations (62.5, 125, 250, 500, and 1000 ppm) for each oil in five replicates and as an adulticidal agent against approximately three-day-old female adults of using 0.5, 1, 2, 4, and 5% concentrations in three replicates. The results generally showed a dose-related response. At 1000 ppm, rosemary oil showed the highest larvicidal (100%) (LC, 214.97 ppm), followed by peppermint oil (92.00% mortality and LC (269.35 ppm). Lavender oil showed the lowest efficacy with 87.20% mortality and LC (301.11 ppm). At 5% oil concentration, the highest knockdown rate at 1 h was recorded for lavender oil (95.55%), followed by peppermint oil (88.89%) and lastly rosemary oil (84.44%). After 24 h, rosemary oil showed the lowest adult mortality rate (88.89%; LC, 1.44%), while lavender and peppermint oils both showed a 100% mortality rate, with (LC, 0.81% and 0.91%, respectively). The chemical constituents of the oils consisted of monoterpenes and sesquiterpenes that determined their insecticidal activities against the target insect stage. The study proposed that rosemary essential oil may be useful for the control of larvae as part of an integrated water treatment strategy, and lavender and peppermint oils may be used in an integrated plan for adult's control.
蚊子是西尼罗河病毒在全球分布最广泛的主要传播媒介。人们多次尝试研究植物性杀虫剂，以避免对传统合成杀虫剂产生抗药性，因为传统合成杀虫剂被认为对生态系统多样性构成威胁。该研究旨在通过气相色谱 - 质谱联用（GC - MS）分析来确定唇形科的三种精油成分，即薰衣草、薄荷和迷迭香。此外，旨在验证这些精油作为杀幼虫剂对[某种蚊虫]三龄幼虫的杀虫活性，每种精油使用五个不同浓度（62.5、125、250、500和1000 ppm），重复五次；以及作为杀成虫剂对大约三天龄的[某种蚊虫]雌性成虫的杀虫活性，使用0.5%、1%、2%、4%和5%的浓度，重复三次。结果总体显示出剂量相关的反应。在1000 ppm时，迷迭香油显示出最高的杀幼虫活性（100%）（LC₅₀，214.97 ppm），其次是薄荷油（死亡率92.00%，LC₅₀ 269.35 ppm）。薰衣草油的效果最低，死亡率为87.20%，LC₅₀为301.11 ppm。在5%的油浓度下，1小时内击倒率最高的是薰衣草油（95.55%），其次是薄荷油（88.89%），最后是迷迭香油（84.44%）。24小时后，迷迭香油显示出最低的成虫死亡率（88.89%；LC₅₀，1.44%），而薰衣草油和薄荷油的死亡率均为100%，LC₅₀分别为0.81%和0.91%。这些精油的化学成分由单萜和倍半萜组成，它们决定了其对目标昆虫阶段的杀虫活性。该研究提出，迷迭香精油作为综合水处理策略的一部分，可能有助于控制[某种蚊虫]幼虫，而薰衣草油和薄荷油可用于成虫控制的综合计划中。
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