Entomotoxicity assay of two Nanoparticle Materials 1-(Al2O3and TiO2) Against Sitophilus oryzae Under Laboratory and Store Conditions in Egypt

Two nano materials Alaminium oxide Al2O3 and Titanium dioxide (TiO2) , were tested against rice weevil Sitophilus oryzae (Coleoptera: Curculionidae) under laboratory and store conditions. Results showed that Nano Al2O3 were found to be highly effective against S. oryzae and nano TiO2 has lower moderately effective against Sitophilus oryzae. Under laboratory conditions, the number of mortality of S. oryzae were significantly increased to 41.4±4.4, 47.8±5.8 and 50.6±3.6 individuals after treated with 3% of TiO2 after 7, 21and 45 days, as compared to 1.0 ± 2.8, 2.0 ± 5.1 and3.0 ± 3.4, respectively in the control.The effect of nanoparticles A2lO3 and TiO2 under store conditions the results showed that the nanoparticles significantly increased the number of mortality reached to 67.3 ±1.4 after 45 days of storage as compared to 3.8 ±3.8 individuals in the control . Accumulative mortality (%) of S. oryzae beetles increased gradually by increasing the period of exposure in case of treated foam with different tested nanoparticles Al2O3 and TiO2 Al2O3 had the highest cumulative mortality (73.3%) followed by TiO2reached to (59.7 %)after seven days.