1Department of Natural Sciences, Higher Normal School of Technological Education of Skikda21300, Skikda- Algeria
2Laboratory of Physical, Chemistry and Biology of Materials, Skikda21300
3Department of Biology, Faculty of Life and Natural Sciences, Badji Mokhtar University, Annaba23000, Algeria
4Biology, Water and Environment Laboratory, University May 8, 1945, Guelma24000, Algeria
*Email: amira_khedidja@yahoo.com (corresponding author)
Online Published on 18 February, 2026.
In this study, the presence of some secondary metabolites was tested in the aerial parts of the medicinal plant Thapsia garganica L. by screening method, then the effectiveness of its powder using by infusion was examined at different concentrations (15, 30, 45 and 60g/ l) on newly moulted fourth-instar larvae (L4) of Culex pipiens L. mosquito. The obtained results revealed that the used plant contains all cited components and exhibits a toxic effect on fourth-instar larvae. This toxicity was evident by an increase in larval mortality with respect to the concentration compared to the control group. The lethal concentrations LC50 and LC90 were estimated at 23.27 g/ l and 69.47 g/ l respectively.
Secondary metabolites, LC50 and LC90, Screening, Toxicity, Culicidae, Hematophageous insects, Pathogens, Neurotoxic insecticides, Biopesticides, Medicinal plants, Algeria
