Essential oils and aqueous extracts were obtained by hydro-distillation of flowers of red torch, pink torch and porcelain variants of Etlingera elatior(Zingiberaceae), a widely cultivated tropical ornamental plant. GC/MS analyses revealed the presence of 43 components with dodecanal, dodecanol and a-pinene being the major constituents, . Oils from the three variants presented potent larvicidal activities against 4th instar Aedes aegypti with LC50 values of 33.47, 42.22 and 26.62 ppm for the red, pink and porcelain variant respectively. Aqueous extracts of the three variants were also active against the dengue mosquito larvae (LC50 values of 1.26, 7.68, and 0.97%, respectively). In further tests, dodecanal e dodecanol showed LC50 values of 50.88 and 7.76 ppm. Oils of three variants showed significant oviposition deterrent effects at concentration of 100 ppm, . The study demonstrates that products with valuable biological activities can be produced from flowers of E. elatiorthat are not of commercial quality.

Composition, larvicidal, and deterrence oviposition activity of Etlingera elatior essential oils against Aedes aegypti L. (Diptera: Culicidae)

245th National Meeting (2013)

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