Resistance of Aedes aegypti to temephos and adaptive disadvantages

Revista de Saúde Pública

Morgana Michele Cavalcanti De Souza Leal Diniz¹  Alleksandra Dias Da Silva Henriques¹  Renata Da Silva Leandro¹  Dalvanice Leal Aguiar¹  Eduardo Barbosa Beserra¹ 

关键词: Aedes;    growth & development;    Temefos;    toxicity;    Insecticide Resistance;    Insect Control;    Dengue;    prevention & control;    Aedes;    crescimento & desenvolvimento;    Temefós;    toxicidade;    Resistência a Inseticidas;    Controle de Insetos;    Dengue;    prevenção & controle;   

DOI  :  10.1590/S0034-8910.2014048004649

来源: SciELO

【 摘 要 】

OBJECTIVETo evaluate the resistance of Aedes aegypti to temephos Fersol 1G (temephos 1% w/w) associated with the adaptive disadvantage of insect populations in the absence of selection pressure. METHODSA diagnostic dose of 0.28 mg a.i./L and doses between 0.28 mg a.i./L and 1.40 mg a.i./L were used. Vector populations collected between 2007 and 2008 in the city of Campina Grande, state of Paraíba, were evaluated. To evaluate competition in the absence of selection pressure, insect populations with initial frequencies of 20.0%, 40.0%, 60.0%, and 80.0% resistant individuals were produced and subjected to the diagnostic dose for two months. Evaluation of the development of aquatic and adult stages allowed comparison of the life cycles in susceptible and resistant populations and construction of fertility life tables. RESULTSNo mortality was observed in Ae. aegypti populations subjected to the diagnostic dose of 0.28 mg a.i./L. The decreased mortality observed in populations containing 20.0%, 40.0%, 60.0%, and 80.0% resistant insects indicates that temephos resistance is unstable in the absence of selection pressure. A comparison of the life cycles indicated differences in the duration and viability of the larval phase, but no differences were observed in embryo development, sex ratio, adult longevity, and number of eggs per female. CONCLUSIONSThe fertility life table results indicated that some populations had reproductive disadvantages compared with the susceptible population in the absence of selection pressure, indicating the presence of a fitness cost in populations resistant to temephos.

【 授权许可】

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