Acaricidal activities of essential oils against two-spotted spider mite, Tetranychus urticae Koch

AbstractEleven essential oils (EOs) were screened for their fumigant and repellent activity against two-spotted spider mite, Tetranychus urticae Koch (Acarina: Tetranychidae) under laboratory conditions. Results showed that, in fumigant toxicity assay, Mentha longifolia L. showed more toxic to T. urticae (LC50 = 11.08 mg L−1 air) and was followed by Mentha piperita L. (LC50 = 15.86 mg L−1 air), Cymbopogon flexuosus (Nees ex Steud.) W. Watson (LC50 = 17.23 mg L−1 air) and Chrysopogon zizanioides (L.) (LC50 = 18.82 mg L−1 air). In repellent activity test, Acorus calamus (L.), M. piperita and C. flexuosus showed 100% repellent activity to T. urticae as compared to Cedrus deodara (Roxb.) and Aegle marmelos (L.) (76.67%).