Nano Silica as A promising Nano Pesticide to Control Three Different Aphid Species Under Semi-field Conditions in Egypt

Abstract

Study the effect of nano silica hydrophilic in comparison with Silica & Lambada as a recommended insecticide against three different economical aphids in Egypt; Myzus persica, Acyrthosiphon pisum and Aphis craccivora (Homoptera: Aphididae) was the aim of this investigation. The study was done throughout the period extended from November, 2015 to February, 2016. The main tested materials was applied as foliar spray on faba beans (Vicia faba L.) the greenhouse and after that fed to either winged or wingless aphids. Faba beans leaves were treated with different concentrations ofsilica, “lambada” 500 ppm, nano-silica hydrophilic; 200, 300, 400 and 500 ppm. Results proved that mortality rate among tested aphids in any of the treatments were directly correlated with the increase in concentration. Also, wingless or wingless aphids gave 100% mortality for all nano concentrations used seven days post investigation the same result observed with silica alone treatment where Lambada gave rates of mortality in the range (46-66%). Then direct spraying winged and wingless was investigated, Results showed that both winged and wingless had close mortality responses %. Where it recorded 68, 100, 84, 94, 98 and 100 mortality % with winged Myzus persica, also mortality % 64, 100, 80, 90, 96, and 98 % with wingless Myzus persica. While it was 74, 100, 86, 96, 100 and 100 % with wingless Acyrthosiphon pisum and 70, 70, 100, 86, 98, 100 and 98 mortality % with winged Acyrthosiphon pisum. The mortality % was 70, 100, 84, 92, 100 and 100 % with winged Aphis craccivora and finally mortality % recorded 74, 100, 90, 96, 100 and 100% with wingless Aphis craccivora Usingsilica, lambada, nano-silica hydrophilic 200, 300, 400 and 500 ppm, respectively. This investigation recommends nano silica hydrophilic at 500 ppm concentration as a promising control method for aphis in Egypt.