To study of Effect of plant essential oils to control thrips (Thysnoptera : Thripidae) this experiment was undertaken 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.) 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. 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