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Effects of the essential oil from Cymbopogon citratus on mortality and morphology of the tick Haemaphysalis longicornis (Acari: Ixodidae)

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Abstract

Haemaphysalis longicornis is one of the most prevalent tick species across eastern Asia, Australia, and New Zealand, and has been implicated as a vector of several pathogenic agents. This study evaluated the in vitro acaricidal efficacy of Cymbopogon citratus (lemongrass) essential oil on unfed H. longicornis using the adult and nymph immersion test, and the larval packet test. Six concentrations with three replications each of 10, 20, 30, 40, 50 and 60 mg/mL (adults and nymphs) were used, and 2.5, 5, 10, 20, 40 and 80 mg/mL (larvae), with control group (50% ethanol). The adult and nymph mortality rates were 98 and 100% at 50 mg/mL, and 95 and 100% at 60 mg/mL, respectively, whereas the larval mortality rate was 94 and 96% at 40 and 80 mg/mL, respectively. Mortality of adult, nymph and larva increased significantly in a dose-dependent manner. The LC50 for adult, nymph, and larva, were 29.21 (95% confidence interval 25.90–32.58), 28.18 (23.78–32.25), and 28.06 (25.57–30.90) mg/mL, respectively. Scanning electron microscopy and light microscopy revealed a disjointed sensilla base from the sockets, cuticular cracks, blocked aeropyles, and shrinking of the midgut. These results showed that C. citratus essential oil could be a good eco-friendly alternative control strategy against ectoparasites like ticks due to its high acaricidal efficacy.

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Acknowledgements

This project was supported by National Natural Science Foundation of China (Grant No. 31272372), the Youth Top Talent Support Program of Hebei Province to Zhijun Yu (Grant No. 2018-2020), the Natural Science Foundation of Hebei Province (Grant No. C2019205064), the Financial Assistance for the Introduction of Overseas Researchers (Grant No. C20190350), the High level talent support project of Hebei Province (Grant No. A201901031) and the Science Foundation of Hebei Normal University (Grant No. L2018J04). Desmond O. Agwunobi was supported by the China Scholarship Council (CSC). The authors thank Hu Yuhong, Wang Duo, Dr. Wang Hui, and Dr. Abolfazl Masoudi for their technical support. We also acknowledge provision of the essential oil by AYUS-Oshadhi Hautpflege (Bühl, Germany).

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Correspondence to Zhijun Yu or Jingze Liu.

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Research involving human and animal rights

This article does not contain any studies with human participants. This study was approved by the Animal Ethics Committee of Hebei Normal University as complying with the Animal Protection Law of the People’s Republic of China (Protocol Number: IACUC-157031).

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Agwunobi, D.O., Pei, T., Wang, K. et al. Effects of the essential oil from Cymbopogon citratus on mortality and morphology of the tick Haemaphysalis longicornis (Acari: Ixodidae). Exp Appl Acarol 81, 37–50 (2020). https://doi.org/10.1007/s10493-020-00485-3

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