Resistance of Aedes
aegypti (L.) (Diptera: Culicidae) to Temephos in Brazil:
A Revision and New Data for Minas Gerais State
Marco. A. P. Horta, Francimar. I. Castro, Cassiano S. Rosa,
Michel C. Daniel, Alan L. Melo
Abstract
Dengue fever affects thousands of people in tropical regions of the
world. Governmental health service in Brazil has used organophosphates
like temephos against Aedes
aegypti larvae since 1967 but today in several regions of
Brazil authors have reported an increase of tolerance of Ae. aegypti to
temephos. Since 1986 when dengue fever was introduced to Brazil, the
disease has been detected every year. In Minas Gerais State, the major
epidemics occurred in 1998 followed by a brand new epidemic peak at the
beginning of 2002. Aiming to verify the susceptibility of Ae. aegypti
population to temephos in the municipality of Coronel Fabriciano, Minas
Gerais State, temephos resistance bioassays with diagnostic dose (0.012
mg/L) were performed with F1 larvae of natural
populations of Ae. aegypti collected with ovitraps. The bioassays 1, 2,
3 and 4 presented mortality rates for Rockefeller population of 97%,
100%, 100% and 99% respectively. Mortality rates for natural population
were 5.12%, 3.37%, 0% and 2.66% for bioassays. The average mortality
was 2.78% for natural population and 99% for Rockefeller mosquitoes.
Results show that the exposure of Ae. aegypti larvae to different
concentrations of temephos revealed resistance in several localities
examined. Comparisons with the results obtained by authors for other
regions in Brazil show that mortality obtained vary from 0.0 to 100%
with mean of 39.29% ± 30.13. Results presented in this paper
serve as parameter to possible changes in Brasil’s Dengue
Control Program aiming the insecticide resistance management.
Key
words
- dengue fever, susceptibility, organophosphates, ovitraps.
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