Rodríguez MM, Bisset JA, Hurtado D, Montada D, Leyva M, Castex M, Hernández H, O Farril LA, Fuentes I

Language: Spanish
References: 15
Page: 125-135
PDF size: 197.36 Kb.

ABSTRACT

Introduction: the control program of Aedes aegypti (Linnaeus) (Diptera: Culicidae) in Cuba uses temephos as larvicide and pyrethroids as adulticide although the organophosphorate chlorpyrifos has been barely used. The level of knowledge about resistance to insecticides is essential to effectively control this species.
Objective: to determine the level of resistance to insecticides of Ae. aegypti from Pinar del Rio in its technical aspect and in commercial formulations.
Methods: one Ae. aegypti strain from the health area "Raul Sánchez" in Pinar del Rio province was evaluated through the World Health Organization bioassays to determine susceptibility of larvae to temephos in its technical formulation. Additionally, three granulated formulations of temephos were evaluated (Abatex- G1, Biolarv G-1 and Temefar G-1). In the adult state, the level of susceptibility to pyrethroids called cypermethrin, deltamethrin, lambda cyhalothrine and to organophosphate chlorpyrifos in its technical formulation. Some of them were evaluated in its commercial formulation (Galgotrin 25 EC (cypermethrin), Aqua KOtrina 2 EW (deltamethrin) and Clorcide 44 EC (chlorpyrifos).
Results: it was found in larvae that the resistance to temephos was high in the technical formulation, but the commercial formulation showed an effectiveness rate of 100 %., with daily change of water, up to 20 days for Temefar G1, 18 days for Biolarv G1 and 12 for Abatex G1. In the assays with adult vectors, the strain turned to be susceptible to cypermethrin, deltamethrin and chlorpyrifos and resistant to lambda cyhalothrin. Regarding the three evaluated commercial formulations, resistance to Aqua K-Otrina 2 EW was proved.
Conclusions: the use of integrated control strategies for Ae. aegypti makes it necessary to reduce the frequency of use of temephos and to recover the effectiveness of this insecticide. Moreover, it will avoid the occurrence of resistance to adulticide products that are still effective for the control of this species in the study area.

REFERENCES

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