Susceptibility of Aedes
aegypti (L.) (Diptera: Culicidae) Immature Forms to
Ivermectin
Cassiano S. Rosa, Daniel S. Albeny, Livia M. S.
Ataíde, Marcrco A. P. Horta & Evaldo F. Vilela
Abstract
Several mosquito populations have already exhibited resistance to
various insecticides, a situation that imposes many problems in vector
control programs in many countries. Several studies have recently
reported a decrease in the persistence of temephos, the main larvicide
used to control Aedes
aegypti in Brazil, suggesting that mosquito populations
have acquired resistance to this organophosphate in several states.
Dengue is one of the most important arthropod-borne diseases in the
world and in Brazil thousands of dengue cases are notified annualy. In
order to verify the effects of ivermectin, a semi-synthetic drug widely
used for treatment of livestock parisitic diseases, on Aedes aegypti
larvae of 3rd and 4th
instar, the insects were submitted to concentrations of 1, 5 and 10 ppm
of ivermectin solution during 5, 15, 10, 60 and 1440 minutes. After 24
hours of observations, mortality rates were scored. Loss of mobility,
progressive paralysis and high mortality of larvae were recorded.
Observations suggest that few minutes of contact with the insect is
sufficient to cause intoxication. Increases in ivermectin concentration
cause a progressive mortality in A.
aegypti larvae. The values presented in the present study
indicate that chemical treatment using ivermectin may be an alternative
to the use of ivermectin in dengue control programs.
Key
words
- Aedes
aegypti, Dengue, ivermectin.
Resumo: Resumo
Texto Completo: HTML
PDF