The 3KGy dose caused complete mortality for Sitophilus  zeamais adults 48h post-irradiation. The eggs of Sitotroga  cerealella failed to hatch at both doses 1.5&3KGy. Usually the newly hatched larvae from irradiated eggs with 0.75 KGy died soon after hatching without passing through metamorphosis.  Different concentrations (0.5, 1, 2, 4 and 8 %) from four selected oils of onion, clove, and orange were tested for their toxicity activity against eggs and weevils. Experiments conducted revealed that garlic oil at 4% concentration was more efficient against the adult weevil than the egg moth and exposure period 48h, which gave 100% and 76.66 % mortality, respectively. It was noticed that the same trend of toxicity for the three other oils held for both species. The reduction in the percent eggs hatched; pupation and emergence were directly proportional to the level of concentrations of tested oils and the time of exposure. Also, the reduction in the F₁ progeny weevils was positively correlated with concentration and exposure time. It is possible using both favorite oils garlic and clove at LC95% to spraying polypropylene sacs for protection irradiated maize grains with a dose 3KGyfrom reinfestation by the tested insect within the storage period tested.