Abstract
Essential oils from plants within the Lamiaceae family at several concentrations were evaluated for their repellent and deterrent properties against Thrips tabaci Lindeman (Thysanoptera: Thripidae), the onion thrips. Rosemary ( Rosmarinus officinalis L.) essential oil repelled onion thrips females at 10% concentration in olfactometer bioassays. In leaf disc bioassays on leek ( Allium porrum L .), 1% concentration of rosemary oil inhibited settling within a 4-h period. In dual-choice experiments marjoram ( Origanum majorana L.) and mint ( Mentha arvensis L.) oil both at 0.1% and 1% concentrations significantly deterred the egg-laying activity of thrips females on treated leaf discs. Lavender ( Lavandula angustifolia L.) oil at 1% and sage ( Salvia officinalis L.) oil at 0.1% concentration affected oviposition. In no-choice assays, thrips oviposition rate was significantly reduced by about 45–60% compared to the untreated control after application of marjoram and lavender oil at 1% or 0.1% concentration. With mint oil, oviposition deterrence was found only at 1% concentration. Repellent and/or deterrent essential oils combined with other control measures against T. tabaci may contribute to the enhancement of biological or integrated pest management strategies.
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