Resumo

MURILLO-ARANGO, Walter; ARAQUE MARIN, Pedronel; HENAO MURILLO, Beatriz  e  PELAEZ JARAMILLO, Carlos A. Insecticide activity of oil/water emulsion of Eucalyptus tereticornis essential oil. Rev Cubana Plant Med [online]. 2013, vol.18, n.1, pp. 109-117. ISSN 1028-4796.

Introduction: the essential oil extracted from Eucalyptus species, including Eucalyptus tereticornis, offers significant potential for control of fungal pathogens and insect pests and medical importance. Objectives: to evaluate the anti-insect activity (acute, chronic and repellent) of an oil/water emulsion of Eucalyptus tereticornis essential oil in terms of their chemical composition. Methods: oil/water emulsion was prepared with essential oil previously extracted, separated and characterized, and two of its fractions (A and B). Their anti-insect activity was evaluated through bioassays on Drosophila melanogaster. Foliar phytotoxicity was evaluated on seedlings of Phaseolus vulgaris. Results: the complete oil showed considerable acute repellent and insecticide activity related to its chemical composition. The acute insecticidal activity of the fractions decreased significantly if compare with that of the whole oil , but neither significant effects on the repellent activity nor phytotoxicity on the bean leaves were observed. Conclusions: the essential oil of this eucalyptus species has considerable anti-insect properties and could be formulated as an insecticide for the control of insects of agricultural and medical significance.

Palavras-chave : Eucalyptus tereticornis; essential oils; anti-insects activity; oil/water emulsion.

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