| Summary: | This study aimed to verify the level of repellent and mortality effect of two chemical substances (DEET and 2-undecanone) and seven essential oils (EOs), <i>Allium sativum</i>, <i>Artemisia annua</i>, <i>Ocimum basilicum</i>, <i>Lavandula angustifolia</i>, <i>Eucalyptus globulus</i>, <i>Pinus sylvestris</i>, and <i>Curcuma longa</i>. The storage pests <i>Tribolium confusum</i>, <i>Tenebrio molitor</i>, and <i>Acanthoscelides obtectus</i> were exposed to various concentrations in an olfactometer-and-mortality test. The effects were recorded 24–48–72 h after the treatments were applied. <i>A. sativum</i>, <i>E. globulus</i>, and <i>L. augustifolia</i> were found to have significant repellence effects. A substantial lethal effect was observed for <i>A. sativum</i>, <i>E. globulus</i>, and <i>O. basilicum</i>. We also found that even if the most efficient EOs were diluted to low concentrations, they still produced repellent and mortality effects. The presented results indicate that <i>A. sativum</i> and <i>O. basilicum</i> were the most effective against <i>T. confusum</i> and <i>T. molitor;</i> simultaneously, <i>L. angustifolia</i> and <i>C. longa</i> showed high activity against <i>A. obtectus</i>. All of these efficient EOs could be applied as effective bio-control agents in various stored conditions.
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