The Type of Grain Counts: Effectiveness of Three Essential Oil-Based Nanoemulsions against Sitophilus oryzae

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 L., (L.) Huds., and (Jum.) Capuron were evaluated as insecticides against the major stored-product pest (L.) on barley, oats, and maize kernels. The EO-based NE applied at 1000 ppm on barley achieved the highest mortality, killing 94.4% of adults after a 7-day exposure, followed by 1000 ppm of EO-based NE (83.3%). The lowest mortality (1.1%) was recorded with 500 ppm of 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, EO-based NE was the most effective when applied on all commodities, followed by and 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. adults on barley can be adequately controlled through the application of and EO-based NEs.