Silica particles, cinnamon and mentha oils were prepared in the form of nano product. Sitophilus oryzae adults were treated with this product. Results indicated that nano silica particles have a greater toxic effect followed by nano cinnamon oil while, nano mentha oil recorded the least one. Hence, the lethal concentration (LC50) and lethal time (LT50) of nano silica were 0.125% and 1.68 days on the adults of S.oryzae followed by 0.163% and 2.09 days for nano cinnamon oil. Finally, nano mentha oil which recorded 0.321% and 2.32 days, respectively. The mortality rate reached 100% at the second week of treatment for nano silica followed by 91.11 and 90.6% for nano cinnamon and mentha oils, respectively. Reduction in progeny ranged from 64.60-100, 64.6-96.2 and 61.0- 95.5% for nano silica, nano cinnamon and mentha oils, respectively. Results showed relatively no significant differences in germination of wheat grains treated with both of nano cinnamon and mentha oils, but significant differences were found in germination of wheat grains treated with nano silica. These forms need more studies to know their safety and effects on environment when they apply for controlling the insects. |
