مقایسه سمیت گوارشی نانو ذرات نقره و سیلیس بر روی شته مومی کلمL. Brevicoryne brassicae

The cabbage aphid, Brevicoryne brassicae, is one of the most serious pests of cruciferous plants. The pest causes direct damage through searching for food, which can lead to plant deformation, as well as indirect damage through honeydew or the transmission of viruses. The use of nanomaterials in various areas of science has increased during the last decade. Nanotechnology has already shown great potential for application in environmental protection. Nanoparticles can be used to produce new pesticides, insecticides and insect repellents. In this study, the toxic effect of silver and silica on the last nymphal instars of the cabbage aphid was investigated using method of para film (digestive toxicity) in laboratory conditions at a temperature of 25±1°C, a relative humidity of 60±5% and a photoperiod of 16 L:8 D. The results showed that the percentage mortality of silica nanoparticles against B. brassicae after 24 and 48 hours was 44.2 and 60.57, respectively. The percentage mortality of silver nanoparticles after 24 and 48 h was 46.5 and 69, respectively. The results showed that the LC50 values of silica nanoparticles against B. brassicae after 24 and 48 h were 603.15 and 137.94 mg.mL-1, respectively. In addition, the LC50 values of silver nanoparticles were 134.4 and 17.73 mg.mL-1 after 24 and 48 h, respectively. Based on the above results, silver nanoparticles have more digestive toxicity than silica nanoparticles on nymphal instars late- instar nymphs of B. brassicae. The findings of this study open up promising prospects for the use of nanoparticles in agricultural pest management.