Effect the extracts of peppermint (Mentha spicata L.) in morphological deformations of mosquitoes Culex molestus Forskal (1775) (Diptera: Culicidae)

The study was conducted to investigate the effect use of water extract and chloroform of peppermint plant Mentha spicata in control of mosquito Culex molestus during the treatment of the fourth instar larvae. Use in the experiment aqueous cold, boiling and chloroform of roots, stems and leaves extracts of Mentha spicata was studies by using concentrations (1,5 and 10) mg/ml of aqueous extracts and (0.25,0.5 and 1) mg/ml of chloroform extract on some biological aspects of Culex molestus by treated fourth instar larvae of the insect, and the results were as follows : The results of the study showed that the above mentioned extracts have an effect in inhibition of emergence and that effect is positively correlated with the concentrations used, the most of these effects were demonstrated by using the chloroform extract of the leaves, as for the effect of the mortality of the fourth instar larvae and pupae, the a cumulative mortality reached 93.9% at the concentration of 0.25 mg / ml and did not differ significantly when the concentration increased to 1 mg / ml, which amounted to 90% we note that the highest percentage of mortality occurred when using aqueous cold, boiled and chloroform for leaves also noted many morphological deformations during the experiments. These extracts may act as insect growth regulators, leading to these deformations.