In this study, the grains of PG400 were treated with different concentrations of essential oils for Clove flowering buds, Dill seeds, Pinus syluestris and Lemion grass. However grains of PS400 were only treated with different concentrations of Annis seeds. The obtained result showed that adults mortality percentage increased by increasing concentration and exposure time of the tested insects. After 14 days from the initial treatment, mortalities were between 83.3-100, 86.7-100, 82.3-100, 71-100 and74.3-100 % at all tested concentrations with Clove flowering buds, Dill seeds, Pinus syluestris, Lemion grass and Annis seeds, respectively. However, reduction in the progeny of S. oryzae was between 57.23-100,57.25-100,59.55-100,56.85-100 and 52.51-100% for Clove flowering buds, Dill seeds, Pinus syluestris, Lemion grass and Annis seeds, respectively However for R. dominica, the adults mortality after 14 days of initial treatment ranged from 36.7-100, 60-100, 82.3-100, 55.7-100 and 61-100 % the various concentrations of Clove flowering buds, Dill seeds, Pinus syluestris, Lemion grass and Annis, respectively. While their, reduction in the progeny ranged from 42,24-100,53.16100,48.38- 100,63.89-100 and 55.18-100% at various concentrations of Clove flowering buds, Dill seeds, Pinus syluestris, Lemion grass and Annis, respectively. The obtained results showed that high concentration of different essential oils caused about 100% mortality and progeny reduction, but the low concentration caused about 70% mortality and progeny reduction. This study suggesting that the low oil concentration could be used to increase the protection for irradiated tolerant populations PG400and PS400 from the infestation with S. oryzae and R. dominica as a complementary tool for pest control.
