Diatomaceous earth, Silica gel. Magnesium carbonate, Dill seed powder. Black pepper seed powder. as well as Agrothrin and Katel-sous were evaluated against the rice weevil Sitophilus oryzae (L.) under laboratory conditions as grain protectants. The results showed that the efficiency of the tested materials markedly increased by increasing the exposure time. All tested materials need an exposure time of at least three days to give a significant percent mortality except for magnesium carbonate. Magnesium carbonate at 0.8 % (w/w) caused 78.0±8 % mortality after 14 days. while katel-sous at its reconiended rate (1 %) caused 100% mortality after the same exposure period. The only fast acting material is Agrothrin.il gives 65±5, 60±4 and 52+4 mortality after two days exposure al concentrations of 1.6. 0.8 and 0.4 % (w/w). All tested grain protectants obviously reduced the percent of -progeny after 60 days with an average 63-99.6 % except for magnesium carbonate. percent reduction in F1 — progeny for magnesium carbonate at 0.8. 0.6. 0.4 and 0.2 % (w/w) were 55, 56. 30 and 23.6 %, respectively. Dill seed and black pepper powders at 2 and 4 % (w/w) drastically reduced F1-progency. Meanwhile. The saine grain protectants were tested against S. orVZae infestation to wheat grains stored in steel bins at 33±2°C and 55+5 (y0 RH. Mortality data recorded after 2. 3 and 5 days showed that Agrothrin (0.2 %) was the most effective and fast acting compound. In general, using the gastight steel bins enhanced the potentialities of the tested grain protectants after 3 or 5 days exposure. except for dill seed powder.