Toxicity and Biological Effects of Fe Nanoparticles against (Fabricius).

Nanotechnology has clear potential in the development of innovative insecticidal products for the biorational management of major insect pests. Metal-based nanoparticles of different microbial pest control agents have been effective against several pests. Synthesis of based Fe nanoparticles (FeNPs) and their bio-efficacy against was observed during this study. conidia were coated with FeNPs and characterized by applying a selection of different analytical techniques. Ultraviolet (UV) spectroscopy showed the characteristic band of surface plasmon at 430 nm; Scanning electron microscopy (SEM) images showed spherical shaped nanoparticles with a size ranging between 0.41 to 0.80 µm; Energy-dispersive X-ray (EDX) spectral analysis revealed characteristic Fe peaks at 6.5 and 7.1 Kev; the X-ray diffractogram showed three strong peaks at 2 values of 45.72°, 64.47°, and 84.05°. The bioassay studies demonstrated that mortality of 2nd instar larvae following FeNPs treatment increased with increasing concentrations of FeNPs at different time intervals. The median lethal concentration (LC) values of FeNPs against after seven days of fungal treatment was 59 ppm, whereas median survival time (LT) values for 200 and 500 ppm concentrations of FeNPs against seven days post-treatment were 5.1 and 2.29 days, respectively. -FeNPs caused significant reductions in feeding and growth parameters (relative growth rate, relative consumption rate, and efficiency of conversion of ingested food) of . FeNPs induced reduction in glutathione-S-transferase activities throughout the infection period whereas activities of antioxidant enzymes decreased during later periods of infection. These findings suggest that FeNPs can potentially be used in biorational management programs.