Toxic effect of the essential oils of Lavendula angustifolia, Bursera pencillata, Syzygium aromaticum and Cyperus rotundus has been evaluated against the coconut mite, Aceria guerreronis through bioassay on infested coconuts. The study has established the toxicity of all the four oils on the mite to varying extent. L. angustifolia (EC50 = 0.09 and EC90 = 1.30 mg/nut) recorded highest acute toxicity. This is followed by B. pencillata, (EC50 = 0.12 and EC90 = 1.09mg/nut) S. aromaticum , (EC50 = 0.20 and EC90 = 1.22mg/nut) and C. rotundus (EC50 = 0.28 and EC90 = 1.56mg/nut) respectively. The investigation further highlighted the potential of these oils for the regulation of the coconut mite and the prospects of essential oils of plants as a novel source of acaricides.