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<p>The aim of our study on the essential oil of the local plant <i>Pelargonium graveolens</i>, collected from Tebessa, Northeast Algeria, is to determine its chemical composition and its toxicity as well as effects on biochemical and enzymatic parameters of <i>Culex pipiens</i> as well as <i>Culiseta longiareolata</i> mosquito at the fourth larval stage. The <i>P. graveolens</i> essential oil was obtained by hydrodistillationthen analyzed using gas chromatography-mass spectrometry (GC/MS). The analysis revealed that the major constituents of this oil were Citronellol (24.86%), followed by Geraniol (20.50%), Citronellylformate (8.30%), Geranyl isovalerate (8.12%), Lavandulyl acetate (5.51%), Menthone (5.26%), and Linalool (2.91%). This essential oil’s toxicity was tested on larvae (stage four) of <i>Cx. pipiens</i> and <i>Cs.longiareolata</i> mosquitoes. Our study has shown that <i>P. graveolens</i> EO has great larvicidal efficiency against L<sub>4</sub> larvae of <i>Cx.pipiens</i> and <i>Cs.longiareolata</i>. For both species, our LC<sub><b>25</b></sub> values were 27.32 and 39.56ppm whileour LC<sub><b>50</b></sub>valueswere 34.39 and 44.95ppm respectively. The results indicate that the essential oil of <i>P. graveolens</i>, applied at the LC<sub><b>25</b></sub> and LC<sub><b>50</b></sub>concentrations, caused a significant decrease (assessed via Student’s t-test, <i>p</i> &lt; 0.05) in protein, lipid, and carbohydrate levels as well as activation of detoxification enzymes, glutathione S-transferase (GST) and catalase (CAT).In conclusion, essential oil of <i>P. graveolens</i> can be used as a natural alternative to insecticides against insects such as <i>Cx pipiens</i> and <i>Cs.longiareolata</i> mosquitoes.</p> Graphical Abstract <p></p>

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GC/MS analysis and insecticidal activity of Pelargonium graveolens essential oil from Algeria against Culex pipiens and Culiseta longiareolata mosquito larvae

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • Rayene Mokhati,
  • Hayette Bouabida,
  • Djemaa Dris

摘要

The aim of our study on the essential oil of the local plant Pelargonium graveolens, collected from Tebessa, Northeast Algeria, is to determine its chemical composition and its toxicity as well as effects on biochemical and enzymatic parameters of Culex pipiens as well as Culiseta longiareolata mosquito at the fourth larval stage. The P. graveolens essential oil was obtained by hydrodistillationthen analyzed using gas chromatography-mass spectrometry (GC/MS). The analysis revealed that the major constituents of this oil were Citronellol (24.86%), followed by Geraniol (20.50%), Citronellylformate (8.30%), Geranyl isovalerate (8.12%), Lavandulyl acetate (5.51%), Menthone (5.26%), and Linalool (2.91%). This essential oil’s toxicity was tested on larvae (stage four) of Cx. pipiens and Cs.longiareolata mosquitoes. Our study has shown that P. graveolens EO has great larvicidal efficiency against L4 larvae of Cx.pipiens and Cs.longiareolata. For both species, our LC25 values were 27.32 and 39.56ppm whileour LC50valueswere 34.39 and 44.95ppm respectively. The results indicate that the essential oil of P. graveolens, applied at the LC25 and LC50concentrations, caused a significant decrease (assessed via Student’s t-test, p < 0.05) in protein, lipid, and carbohydrate levels as well as activation of detoxification enzymes, glutathione S-transferase (GST) and catalase (CAT).In conclusion, essential oil of P. graveolens can be used as a natural alternative to insecticides against insects such as Cx pipiens and Cs.longiareolata mosquitoes.

Graphical Abstract