Abstract
The red imported fire ant is one of the world’s most devastating invasive species, adversely affecting humans, wildlife, crops, and livestock. To control infestations, chemical pesticides are deployed extensively around the world. However, their extensive use has led to negative effects on the environment and human health. Essential oils, which are safe and ecofriendly, can potentially be used as alternatives to chemical pesticides. In this study, grapefruit essential oils were used as fumigant agents to control red imported fire ants. The crude grapefruit oil (GO1) contained 28 compounds, and the concentrated grapefruit oil (GO2), which was refined from GO1 by vacuum distillation, contained 20 compounds. D-Limonene was the dominant constituent in both GO1 (70.1%) and GO2 (73.96%), and other important constituents included β-pinene, α-pinene, β-phellandrene, octanal, d-carvone, α-terpineol, and linalool. Both the essential oils and their individual constituents (α-pinene, α-terpineol, β-phellandrene, octanal, and d-carvone) showed strong lethal fumigant effects against workers. Workers were more susceptible to GO2 than GO1, and octanal was more toxic to workers as compared with the other four constituents. When antennas of workers were treated with the two oils or the five constituents, their walking and gripping abilities were significantly suppressed, and there was an obvious bending or breaking phenomenon on the sensilla of the antennas. Fumigant activity by grapefruit essential oils and their main compounds were associated with their effects on the walking and gripping behavior of workers, and this confirmed that grapefruit essential oil is a promising, ecofriendly, and safe fumigant for the control of red imported fire ants.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was supported by the National Natural Science Foundation of China (32001967), the Jiangxi Province Natural Science Foundation (20202BABL215007), the Foundation of Jiangxi Province Educational Committee (GJJ190760), the Program of Science and Technology Planning Project of Ganzhou ([2020]60 and [2019]60), the University Students’ Innovative Undertaking of Gannan Normal University (CX190015), and the Program of Science and Technology Planning Project of Xichang ([2020]209).
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Ning Zhang analyzed the data and wrote the manuscript. Yihong Liao and Lianjie Xie performed the experiments. Zhixiang Zhang and Wei Hu gave the direction of research and reviewed the manuscript. Fan Kuang revised the manuscript.
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Zhang, N., Liao, Y., Xie, L. et al. Using essential oils from Citrus paradisi as a fumigant for Solenopsis invicta workers and evaluating the oils’ effect on worker behavior. Environ Sci Pollut Res 28, 59665–59672 (2021). https://doi.org/10.1007/s11356-021-14910-6
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DOI: https://doi.org/10.1007/s11356-021-14910-6