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Essential oil (EO)-based nanoemulsions (NEs) are promising grain protectants in the management of stored-product pests. However, the potential impact of the stored-grain species on the green insecticide effectiveness has been poorly studied. In this study, two concentrations of EO-based NEs from <i>Carlina acaulis</i> L., <i>Mentha longifolia</i> (L.) Huds., and <i>Hazomalania voyronii</i> (Jum.) Capuron were evaluated as insecticides against the major stored-product pest <i>Sitophilus oryzae</i> (L.) on barley, oats, and maize kernels. The <i>C. acaulis</i> EO-based NE applied at 1000 ppm on barley achieved the highest mortality, killing 94.4% of <i>S. oryzae</i> adults after a 7-day exposure, followed by 1000 ppm of <i>H. voyronii</i> EO-based NE (83.3%). The lowest mortality (1.1%) was recorded with 500 ppm of <i>M. longifolia</i> EO-based NE on maize after the same interval. All tested NEs exhibited elevated efficacy when applied on barley, while mortalities were lower on oats and maize. Furthermore, <i>C. acaulis</i> EO-based NE was the most effective when applied on all commodities, followed by <i>H. voyronii</i> and <i>M. longifolia</i> EO-based NEs. Overall, our results highlighted the significant impact of the stored cereal on the insecticidal effectiveness of EO-based NE used for stored-product pest control. <i>Sitophilus oryzae</i> adults on barley can be adequately controlled through the application of <i>C. acaulis</i> and <i>H. voyronii</i> EO-based NEs.