Effects of three organophosphorus insecticides in the reproductive potential of Culex quinquefasciatus

• Main Authors: Lucita Aguilera, Maria del Carmen Marquetti, Agustin Navarro, Juan Bisset
• Format: Article
• Language: English
• Published: Instituto Oswaldo Cruz, Ministério da Saúde 1995-06-01
• Series: Memórias do Instituto Oswaldo Cruz.
• Subjects: insecticide; malathion; chlorpyrifos; methyl-pirimphos; reproduction; Culex quinquefasciatus
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761995000300018

A Culex quinquefasciatus Say 1823 strain with resistant genes to organophosphates was tested in the laboratory to know the reproductive potential after exposure, as larvae, at the LC30 and LC70 (mg/l) of three organophosphorus insecticides: malathion, chlorpyrifos and methyl-pirimiphos. Data showed that fecundity was decreased significantly by malathion at LC30 = 0.0025 and LC70 = 0.0075, whereas fertility has a no significant decrement by chlorpyrifos and methyl-pirimiphos at the LC70 (0.000016, 0.00043). The sexual index was affected by chlorpyrifos and methyl-pirimiphos showing a greater number of adult females.