EFFICACY OF DIRECT USE OF SOME NANOMATERIALS IN CONTROL COTTON LEAF WORM (SPODOPETRA LITTORALIS):- DETERMINATION OF SOME ENZYMES BY OPTICAL SENSORS

Abstract

Effect of nano materials against cotton leafworm Spodopetra littoralis (Boisd). The Egypt cotton. leaf worm considered one of the most serious. and destructive pest ,not only for cotton plants. in fields ,but also other vegetable and fruit crops, and cause damage. To avoided this damage people directed. to use of pesticides, they found dangerous side effects to these pesticides on human health and environment beside its highly cost. So we directed to use alternative method more save and hadn’t any unfavorable side. effects of the health, environment from these alternative method use of nanoparticle providing effective control and avoiding. environmental pollution. This study was investigated at Plant .Protection. Research Institute, A.R.C, (Dokki –Giza), Egypt. The following point were studied 1- Preparation of some nanomaterials: this include Nano silver by preciptation method, Nano silica by sol-gel method and Nano Fe2O3 (magnetic) by hydrothermal method . After this step we take the three particles silver,silica and iorn oxide , then, inter them in the Transmission Electron. Microscopy (TEM) which present in the National. Research Center (Dokki –Giza) to make sure of these materials in the nano form by determine the internal structure of these materials. Also, Nanomaterials were prepared as wettable powder formulation 15% in Pestiside Formulation Research Department, control Agriculture .Pesticides laboratory. Finally, take these nanoparticle in different concentrations (2500, 3000, 3500 and 4000).