n African Entomology - Increase in tolerance of larvae (Diptera: Culicidae) to the insecticide temephos after exposure to atrazine

Volume 23, Issue 1
  • ISSN : 1021-3589



Female mosquitoes are vectors of yellow fever, dengue and chikungunya viruses. Pre-exposure of larvae to the herbicide atrazine significantly reduced their sensitivity to the organophosphate insecticide temephos. Mosquito larvae pre-exposed for 48 h to non-lethal concentrations of atrazine ranging from 1 to 10 µg/l commonly encountered in the field, appeared slightly less sensitive to temephos than non-pre-exposed larvae. The effect of a pre-exposure to atrazine on larval tolerance to temephos did not seem to be related to an induction of detoxification processes by this herbicide. No important increase in glutathione transferase, or α- and β-esterase activities was observed in pre-exposed larvae, while P450 monooxygenase activities increased.

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