Effectiveness of some plant extracts on the pupal stage of Culex quinquefasciatus (Diptera: Culicidae)

This study aims to evaluate the effectiveness of plant extracts Artemisia herba-alba, Matricharia chamomella, and Melia azedarach against the Culex quinquefasciatus. The following concentrations were used to assess the effectiveness of A. herba-alba, M. chamomella, and M. azedarach: 0.50, 1.00, 1.50, 2.00, 2.50 and 3.00 mg / L; 0.12, 0.25, 0.50, 0.75, 1.00 and 1.50 mg / L and 0.50, 0.75, 1.00, 1.50, 1.75 and 2.00 mg / L, respectively. The mortality rates of the mosquito pupae were measured after 24 hours. It was found that the LC₅₀ was 0.50, 1.00 and 1.80 mg / l of M. chamomile, M. azedarach, and A. herab-alba respectively which mean that M. chamomella extracts had the best pesticide effects against Cx. Quinquefasciatus pupae where was A. herba-alba the lower of them.