الفهرس 
Toxicity of certain nanopesticides on the cotton leaf worm, spodoptera littoralis (Boisd.) in Egypt and South Africa
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Abstract
The cotton leafworm, Spodoptera littoralis (Boisd.), is one of the most dangerous insect pests in Egypt and South Africa, which causes losses of cotton and economic crop yield. This study devoted to developing a novel synthetic scheme to produce a pesticide nanocomposite of very high efficiency compared to its original ones. The method based on using silver nanoparticles (AgNPS) as a pesticide carrier by loading the Organophosphorus pesticide Profenofos (P) and the Pyrethroid pesticide Lambda-cyhalothrin (L-CYN) encapsulation. The nature of particles binding has been investigated via UV-visible spectral analysis, TEM and FT-IR devices. Nanosilver (AgNPS), nanoprofenofos (AgNPS@P) and nanolambda-cyhalothrin (AgNPS@L-CYN( were detected at wave length of 423, 426 and 433 nm, by using UV-visible spectral, with particle size ranging from 7.52 {u2013} 23.62, 11.49 {u2013} 30.17 and 3.24{u2013} 15.21nm, respectively by using Transmission Electron Microscope (TEM) device. FTIR analysis revealed the disappearance of one band in AgNPS@P graph in comparing of Profenofos graph and shifting of peaks was found in AgNPS@P and AgNPS@L-CYN than those of P and L-CYN due to the formation of the co-ordinate band between silver atom and starch during the reaction