Abstract

ALVAREZ, Leslie; BRICENO, Arelis  and  OVIEDO, Milagros. Resistance to Temephos in populations of Aedes aegypti ( Diptera: Culicidae) of the west of Venezuela. Rev. Colomb. Entomol. [online]. 2006, vol.32, n.2, pp.172-175. ISSN 0120-0488.

Organophosphate insecticides have played an important role in the control of Aedes aegypti, vector of dengue fever and dengue haemorrhagic fever in Venezuela and other countries. For more than 20 years, in Venezuela, Temephos have been used as a larvicide and Malathion as an adultcide in the control campaigns for this vector. For these reasons we selected five strains of A. aegypti from four Venezuelan states: Trujillo (PTO and SM), Zulia (Z), Falcón (F) and Táchira (TB); to determinate resistance levels against Temephos. Bioassays were done with IV stage larvae testing five insecticide concentrations, according to the WHO methodology. Strains TB, Z, SM and F were susceptible with FR₅₀ values below 5 fold. The strain (PTO) is showed resistance (6,3 fold). Our results suggest that these populations should be under surveillance constantly to observe any change in resistance levels against Temephos. Additionally, is necessary to know the behavior of any A. aegypti population that could be object of vectorial control with this insecticide in Venezuela, to warrant its effectively action.

Keywords : Control; Dengue; Larvae.

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