Pages: 7-13

Abstract

ABSTRACT: Silica gel Cab-O-Sil-750, silica gel Cab-O-Sil-500 silica gel Cab-O-Sil-750, silica gel Cab-O-Sil-500 were tested against the rice weevil Sitophilus oryzaeunder laboratory and store conditions. Results showed that under laboratory conditions, the number of mortality of S. oryzaewere significantly increased to 49.4±4.4, 57.8±5.3 and 50.6±3.2 individuals after treated with 3% of silica gel Cab-O-Sil-750 , silica gel Cab-O-Sil-500 after 7, 21and 45 days, as compared to 1.0 ± 2.8, 1.0 ± 5.1 and 2.0 ± 3.1, respectively in the control.The number of mortality scored a higher mortality reached to 37.1±3.2, 40.4±3.4 and 44.7±5.1 individuals after treated with1% of Silica gel Cab-O-Sil-750, silica gel Cab-O-Sil-500 nanoparticles as compared to 2.0 ±3.8, 1.0 ±5.1 and 2.0 ±3.1 individuals, respectively.The effect of the nanoparticles (Silica gel Cab-O-Sil-750, silica gel Cab-O-Sil-500) against Sitophilus oryzae under store conditions. In 0.2% treatments with nano Silica gel Cab-O-Sil-750, silica gel Cab-O-Sil-500, and the number mortality of S. oryzae were significantly increased to 14.1±2.3, 28.2±8.8 and 29.8±3.9 individuals after nano Silica gel Cab-O-Sil-750, and silica gel Cab-O-Sil-500 treatments as compared individuals in the controlThe number of eggs laid /female were significantly reduced. After 100 and 120 days the number of eggs laid/ female were significantly decreased to 6±1.0 and 11±0.51 as compared to 99.1±1.43 and 97.2±1.82 in the control. The % reduction values in the number of laid eggs and adult emergence after 120 days were 91 and 90%, respectively in case of Silica gel Cab-O-Sil-750 , silica gel Cab-O-Sil-500 application on foam covering gunny bags provided promising oviposition deterrence, toxicity and suppressing S. oryzae infestation, persistence and protecting rice seeds from beetles’ infestation for 120 days during storage.