Storage pests are a constant threat when storing agricultural products in warehouses and silos. Most often, these are tiny organisms that, by reproduction and feeding, cause great qualitative and quantitative damage to stored products. One of the most important pests is the grain weevil, Sitophilus granarius L.. Excessive use of synthetic insecticides has caused the appearance of pest resistance. Recently, there has been an increasing interest in researching more environmentally friendly insecticides. Among botanical preparations, essential oils represent a promising alternative due to their properties, availability and cost-effectiveness. The effectiveness of essential oils of lavender, rosemary, basil, mint and sage on reducing nutrition and mortality of grain weevil was investigated in the paper. Wheat grain was treated with each essential oil in three different concentrations (1%, 3% and 6%). Plain water was used as a control. The research included a total of sixteen variants, and each variant was placed in five repetitions. In each variant, five individuals of the adult grain weevil were added. Weevil mortality was monitored every 24 hours for seven days. The effectiveness of the oils was calculated according to the Schneider-Orelli formula, and the data were processed by ANOVA. Peppermint essential oil at the highest concentration (6%) achieved full effectiveness already 48 hours after setting up the experiment. The highest concentrations of rosemary and basil essential oils proved to be effective, with 92% and 98% effectiveness on the seventh day. Lavender and sage essential oil proved to be less effective in causing pest mortality. The research did not determine the effect of essential oils on the reduction of grain weevil feeding.