Chemical Composition, Repellency, and Insecticidal Activity of Leaf Essential Oil from Morocco on Adults of (Fabricius) (Coleoptera: Bostrichidae) and (Herbst) (Coleoptera: Tenebrionidae).

and are two significant insect pests that affect the quality, quantity, and commercial value of stored products. The aim of this study was to assess the chemical composition, repellency, and insecticidal activity of leaf EO on adults of (Fabricius) (Coleoptera: Bostrichidae) and (Herbst) (Coleoptera: Tenebrionidae). The EO of Mill. was extracted using hydrodistillation and analyzed for its chemical composition by GC-MS. The major components identified were 1-nonadecene (25.51%), 1-hexadecene (20.79%), pimaric acid (16.71%), and palmitic acid (12.47%). The repellency test was determined by the area-preference method. EO exhibited significant repellent activity against and . It showed high class IV repulsion rates, reaching 63.60% against and 66.50% against . The repellent effect was most potent at the highest concentration tested (16 µL/mL), achieving a 100% efficacy against after 4 h and after 3 h against . The contact toxicity test was carried out by impregnating filter paper disks with increasing doses of the EO studied. EO was the most toxic against (LC = 17.11 µL/mL, LC = 30.02 µL/mL) and (LC = 20.92 µL/mL, LC = 32.18 µL/mL) after 96 h of exposure. The ability of EO to repel and eliminate insects suggests that it could be used as a new treatment to prevent insect infestations of and .