Chemical and biological control on Aedes aegypti larvae in the northern coastal region of Jalisco, Mexico

[摘要] Introduction: the increase of diseases transmitted by mosquitoes hasbeen associated to global changes such as the population growth, urbanizationand climate change. Among the alternatives to avoid epidemics are the chemicaland biological control. Objectives: to determine effective concentrations of three chemicalcompounds to control Aedes aegypti larvae in the northern coastal region ofJalisco and to evaluate the predatory ability of various aquatic species onmosquito larvae. Methods: five concentrations of temephos of (1.5, 1, 0.1; 0.05 and0.01 g/L), sodium hypochlorite (5.5, 0.55, 0.05, 0,005 and 0.0005 g/L) anddetergent (10, 5, 1, 0.5, 0.1 g/L) were evaluated. Larval death was estimatedat different times (1, 3, 5, 9 and 24 h) and the LC50 was calculated. Fourfish species, one crustacean and one dipteral culicid larva were evaluated.All were provided with different numbers of larvae (5, 10, 30, 50 and 80)five times and the larval consumption was recorded at different times (1,3, 5, 9 and 24 h).Results: temephos caused 100 % mortality of larvae in all tested concentrations.The NaClO caused 100% mortality at the two highest concentrations. The detergentwas more efficient at the three higher concentrations. Fish proved to be efficientpredators of larvae, as they consumed almost 100 % of larvae in most of testeddensities. The diptera culicid larva reached around 80 % consumption whereascrustacean consumed only 53 %. Conclusions: the use of temephos should remain the chemical larvicideof choice in Puerto Vallarta region. Native fish are suggested to be usedas appropriate biological control agents.

[学科分类] 传染病学

[关键词] culicid;temephos;detergent;chlorine;mosquito;mortality.