Neotropical Entomology (2005) 34, 843-847

Roselayne F. Furtado, Maria G.A. de Lima, Manoel Andrade Neto, José N.S. Bezerra and Maria G. de V. Silva (2005)
Atividade larvicida de óleos essenciais contra Aedes aegypti L. (Diptera: Culicidae)
[Larvicidal activity of essential oils against Aedes aegypti L. (Diptera: Culicidae)]
Neotropical Entomology 34 (5), 843-847
Abstract: In the search for alternative chemical control against Aedes aegypti L., many researches are developed and encouraged in order to find new insecticidal plant substances. In this work, the larvicidal effect of ten essential oils was tested on A. aegypti. The oils were extracted by steam distillation and their chemical composition determined by GL-chromatography coupled with mass spectroscopy. The essential oils were diluted in aqueous solutions of dimethyl sulfoxide with concentrations of: 100, 50, 10, and 1 mg/ml. The larvicidal activity, based on the percentage of larval mortality, was evaluated after 24h exposure to the treatments. The essential oil of Vanillosmopsis arborea Baker presented the highest larvicidal activity, with CL₅₀ of 15.9 mg/ml and CL₉₀ of 28.5 mg/ml. On the other hand the essential oil of O.gratissimum L. showed the lower activity with CL₅₀ de 95,80 mg/ml and CL₉₀ de 102,86 mg/ml.The results indicate that the tested essential oils, and particularly the V. arborea, are composed by substances with larvicidal properties for A. aegypti.

Na busca por controle químico alternativo contra Aedes aegypti L., muitas pesquisas são desenvolvidas e estimuladas no intuito de se descobrirem novas substâncias inseticidas de origem vegetal. Neste trabalho, o efeito larvicida de dez óleos essenciais foi avaliado contra A. aegypti. Os óleos foram obtidos por arraste a vapor e sua composição química foi determinada por cromatografia gasosa acoplada a espectrometria de massa. Os óleos essenciais foram diluídos em solução aquosa de dimetil sufóxido nas concentrações: 100, 50, 10 e 1 mg/ml. A atividade larvicida, baseada na percentagem de larvas mortas, foi avaliada 24h após o tratamento. O óleo essencial de Vanillosmopsis arborea Baker induziu a maior atividade larvicida, com CL₅₀ de 15,9 mg/ml e CL₉₀ de 28,5 mg/ml., enquanto o de O. gratissimum L. apresentou a menor atividade com CL₅₀ de 95,80 mg/ml e CL₉₀ de 102,86 mg/ml. Os resultados indicam que os óleos essenciais avaliados, principalmente o de V. arborea, são compostos por substâncias com efeito larvicida contra A. aegypti.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article

Research topic(s) for pests/diseases/weeds:
control - general

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Aedes aegypti