author(s)
Maryam Forouzan, Abbas Hosseinzadeh, Shahram Aramideh, Akbar Ghassemi-Kahrizeh, Shahram Mirfakhraie and Samira Mahinfar

abstract
Many plants have compounds with insecticidal properties and due to the high damage pests and adverse effects of pesticides, using of these compounds and essential oils is the best way to control pests. This study was carried out to determine the insecticidal activity of essential oil Artemisia annua L. against adult of three most important stored pests namely, Tribolium castaneum Herbst., Sitophilus granarius L. and Callosobruchus maculatus F. The experiments were planned in three replicate with completely randomized design under 27±1 °C, 60±5 R.H. under dark condition. The result was evaluated after 24 and 48h. The results indicated that the fumigant toxicity of essential oil against these pests. LC₅0 values for A. annua treatments on T. castaneum, S. granarius and C. maculatus were 75.528, 59.356 and 56.916 µl/l air and for Acetone 161.564, 138.733 and 123. 119 µl/l air, respectively, and LC₂₅ values of A. annua and Acetone treatments on T. castaneum, S. granarius and C. maculatus were 45.808, 37.282 and 32.903 µl/l air and 113.614, 91.806 and 80.862 µl/l air, respectively. Then Acetone synergistic effects were tested on A. annua essential oil lethality. For this purpose, LC₂₅ value of Acetone with a combination of LC₂₅ value of Artemisia essential oil were tested against adult of three pests and results showed Acetone have synergistic effect on fumigant toxicity of A. annua.