Contact and fumigation toxicity of Clove and Dill essential oils were investigated in the laboratory against the adults of Sitophilusoryzae (L.), Rhyzoperthadominica (F.) and Triboliumcastaneum (Herbst.). The results showed that insect mortality was increased by increasing plant oils concentration and the period of exposure. The adults of S. oryzae were the most susceptible insect species under study followed by R. dominica then T. castaneum which was the least sensitive to the two plant oils. The toxicity of Clove and Dill oils against the tested insects was much higher in the fumigant bioassay tests than in the contact method. Clove oil was more effective than Dill oil against the three insect species. The results indicated also that these plant oils could be used as grain protectants or fumigants to control stored products insects