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Tetranychus urticae Koch (Acari: Tetranychidae) is a harmful pest of plants worldwide. Essential oils and their components are potential alternatives to the use of synthetic pesticides for two-spotted spider mite control. The aim of this study was to investigate the contact and repellency effects of Rosa damascena essential oil and its two major constituents, geraniol and citronellol, on Tetranychus urticae. A total of 22 compounds were identified by GC-MS analysis, and citronellol (23.43%) and geraniol (34.91%) were the main scent compounds of the fresh rose flowers. To determine the contact effect, 1, 5, 10 and 20 ml/l concentrations of rose essential oil, geraniol and citronellol were applied to egg, nymph and adult life stages of two-spotted spider mites using the leaf disc-spray tower method. To determine the repellency effect, 0.1, 1, 5 and 10 ml/l concentrations of rose essential oil, geraniol and citronellol were applied to nymphs and adults of Tetranychus urticae. The study showed that rose oil, geraniol and citronellol had contact, repellent and ovicidal effects on the different life stages of T. urticae. In addition, geraniol was found to have the highest contact, repellent and ovicidal activity, followed by rose oil and citronellol. The results suggest that Rosa damascena essential oil and its two major constituents, geraniol and citronellol, can potentially be used for the management of Tetranychus urticae. |
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