Olive oil, soybean oil, oil-malathion mixture beside malathion as a typical insecticide were tested to protect wheat grains against Sitophilus oryzae and Rhizopertha dominica infestation during storage. The efficiency of soybean oil was higher than olive oil where the LC50 of both treatments were 3.92 and 8.85 nil/kg wheat grains for Si‌tophilus oryzae and 12.53 and 14.60 ml/kg wheat grains for Rhizoper‌tha dominica, respectively. Malathion at the extremely lowest concentration used had immedi‌ate lethal effect than plant oils. Olive oil at any tested dose, gave a complete protection for wheat grains during six months, meanwhile soybean oil failed to give the same protection after two months. The adult mortality increased by increasing the concentration of the tested oils or the addition of malathion. Application of oils showed an increase in fat acidity value and a neg-ligible decrease in percentage of germination. KEY WORDS: Sitophilus oryzae (L.), Rhizopertha dominica (F.), Malathi‌on, olive and soybean oils.