Trials were designed to determine median effective concentra-tions or doses (LC50values) to cause mortality of 50% of test insects.Ten unsexed adult insects were put into 38 ml Plexiglas bottles withscrew lids. Control insects were kept under the same conditionswithout any essential oil. Each dose was replicated five times. Mor-tality was evaluated by direct observation of insects. The numberof dead and live insects in each bottle was counted 24 h after ini-tial exposure. Data were analyzed using Finney’s method (Finney,1971).