Abstract
Leaf disc bioassays were conducted to determine the effects of essential oils and their volatile constituents from plant species ( Lamiaceae family) at three concentrations ranging from 0.01% to 1% on the feeding activity of adult female onion thrips ( Thrips tabaci Lindeman; Thysanoptera: Thripidae). The percentage of feeding damage area on leek ( Allium porrum L .) leaf discs and the adult survival was assessed after 24 h. Onion thrips were significantly deterred by the essential oils of marjoram ( Origanum majorana L.), lavender ( Lavandula angustifolia L.) and mint ( Mentha arvensis L.) at several concentrations, and by the oil of rosemary ( Rosmarinus officinalis L.) at 1% concentration. Furthermore, thrips feeding damage was reduced as a result of linalool and eugenol application at three concentrations. Adult survival on the leaf disc surface was significantly decreased by application of terpinen-4-ol at 1% concentration. Evaluation of the potential of biologically active plant volatiles against T. tabaci may provide a new approach to the development of antifeedants and/or natural insecticides for use in both biological and integrated pest management strategies.
Published Version
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