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Fumigation activity of essential oils of Cinnamomum loureirii toward red imported fire ant workers

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Abstract

Synthetic pesticides used to control Solenopsis invicta Buren (Hymenoptera: Formicidae) can negatively affect human and environmental health due to non-target toxicity and long-lasting residues. Plant essential oils may have lower human health impacts and environmental toxicity. They can be an excellent source of pesticides because of their exceptional repellency and insecticidal properties. In this study, we used the fumigation method to study the insecticidal properties of essential oils from the bark and leaves of Cinnamomum loureirii Nees on S. invicta at different concentrations and fumigation time. The fumigation time with C. loureirii essential oils was positively correlated with the knockdown and mortality of S. invicta and negatively correlated with the grasping. The essential oils at 320 µg/cm3 had a noticeable fumigation effect. The insecticidal effect of the essential oils extracted from C. loureirii leaves was significantly stronger than that from the bark at effective concentrations. Cinnamyl acetate, an abundant component in leaf essential oils, plays a vital role in increasing the insecticidal effect of trans-cinnamaldehyde. The treatment of the mixed trans-cinnamaldehyde and cinnamyl acetate in a 2:1 ratio had the best insecticidal effect (at 50 and 25 µg/cm3, respectively) and more apparent electroantennogram change than the individual compounds. Essential oils caused disorganization and shedding of the antennae morphology and receptors that led to the death of S. invicta. This study provides a basis for developing and utilizing cinnamon leaf oil as a new environment-friendly insecticide resource to control S. invicta.

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Acknowledgements

We thank Guangdong Institute of Biological Resources for technical support.

Funding

This research was supported by the Natural Science Foundation of Guangdong Province (2019A1515011005), the Guangdong Basic and Applied Basic Research Foundation (2020B1515420007), the Science and Technology Innovation Fund Project on Forestry of Guangdong Province (2017KJCX006) and the 2019 South China Agricultural University high-level university construction special fund "Top-notch" project support.

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Correspondence to Hanhong Xu or Hong Wu.

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The authors declare no conflicts of interest.

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This article does not contain any studies with human participants or animals (vertebrates) performed by any of the authors.

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Informed consent was obtained from all individual participants included in the study.

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Communicated by Orlando Campolo .

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Xing, H., Hu, Y., Yang, L. et al. Fumigation activity of essential oils of Cinnamomum loureirii toward red imported fire ant workers. J Pest Sci 96, 647–662 (2023). https://doi.org/10.1007/s10340-022-01540-1

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  • DOI: https://doi.org/10.1007/s10340-022-01540-1

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