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August 17, 2021Ecotoxicology and Environmental SafetyOpen Access

Chemical composition of essential oils from Thymus mongolicus, Cinnamomum verum, and Origanum vulgare and their acaricidal effects on Haemaphysalis longicornis (Acari: Ixodidae)

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Authors

YQYe QiaoZYZhijun YuLBLingqian Bai

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Overview

Laboratory study reveals potent acaricidal toxicity of plant essential oils against Haemaphysalis longicornis ticks, highlighting eco-friendly alternatives to synthetic acaricides.

Key Points

  • To characterize the chemical composition of essential oils from Thymus mongolicus, Cinnamomum verum, and Origanum vulgare and evaluate their acaricidal and enzyme-inhibitory activities against the tick Haemaphysalis longicornis.
  • Identified chemical constituents of Thymus mongolicus, Cinnamomum verum, and Origanum vulgare essential oils using gas chromatography-mass spectrometry.
  • Tested immersion toxicity against larvae and unfed adult Haemaphysalis longicornis, and evaluated fumigant toxicity against unfed and engorged nymphs and adults.
  • Conducted enzyme assays to quantify essential oil inhibition of tick glutathione S-transferase, carboxylesterase, and multifunction oxidases.
  • Immersion tests showed the highest larval toxicity from C. verum (LC50 = 16.07 mg/mL; LC95 = 120.37 mg/mL) and O. vulgare (LC50 = 18.02 mg/mL; LC95 = 130.09 mg/mL), whereas O. vulgare (LC50 = 43.50 mg/mL; LC95 = 113.66 mg/mL) and T. mongolicus (LC50 = 44.21 mg/mL; LC95 = 137.99 mg/mL) were most toxic to unfed adults.
  • Fumigant toxicity assays demonstrated significant acaricidal activity across all three essential oils against both unfed and engorged nymphal and adult ticks.
  • Carboxylesterase and multifunction oxidases were significantly inhibited by all three essential oils (P < 0.05), while glutathione S-transferase was significantly inhibited by C. verum and O. vulgare oils (P < 0.05).

Cite This Study

Qiao et al. (2021) studied this question.

synapsesocial.com/papers/6a1492f86667a4fa718eef65https://doi.org/10.1016/j.ecoenv.2021.112672
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Also Consider

Synapse has enriched one closely related paper. Consider it for comparative context:

  1. 1Expression profiles of glutathione S-transferases genes in semi-engorged Haemaphysalis longicornis (Acari: Ixodidae) exposed to Cymbopogon citratus essential oil2020 · 9 citations