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Abstract
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Some of the plant essential oils are suitable alternatives for chemicals in pest control. Oryzaephilus surinamensis is one
of the most important stored product pests causing serious damage to the stored products. In order to evaluate the
environmental friendly control methods of the pest, fumigant toxicity of three plant essential oils, namely, Cupressus
arizonica, Tanacetum balsamita and Lavandula officinalis have been evaluated on the adults of O. surinamensis. The
experimentation was conducted using a completely randomized design of factorial experiment with six concentrations and
three replications at 25±2ºC, 60±5% RH in darkness conditions. Results showed mortality increased with increasing the
concentrations over the time. L. officinalis with the LC50 value of 0.09 ìl (2.72 ìl/l air) showed the highest toxicity, and T.
balsamita and C. arizonica with LC50 amounts of 0.16 ìl (4.84 ìl/l air) and 1.22 ìl (36.96 ìl/l air) achieved lower toxicity
against the pest, respectively. The LT50 values of L. officinalis, T. balsamita and C. arizonica essential oils in concentrations
9.06, 12.08 and 48.35 ìl/l air were calculated as 2.5, 5.84 and 14.27 hour, respectively. Results revealed that L. officinalis
essential oil have high potential in the pest control which can be a suitable alternative in O. surinamensis control management
programs.
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