Abstract
Summary Essential oils have been extracted by hydrodistillation from several plants: Mentha piperata L., Origanum vulgare L., Thymus vulgaris L., Satureia hortensis L., Rosmarinus officinalis L., Lavandula angustifolia Miller, Eucalyptus globulus Labill., Laurus nobilis L. and Cymbopogon nardus L. These oils have been tested on Acanthoscelides obtectus Say, Bruchidae, Coleopterae, the pest of Phaseolus vulgaris L., and it has been observed a toxicity by inhalation [LC50 24h between 2 and 60 mg.ídm3)−1, LC50 48h between 1,5 and 25 mg.(dm3)−1]. The cluster analysis distinguished several classes of LC50. The oils from Labiae family, except M. piperata, have the best insecticidal effect.
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