Materials and Methods
Experimental design
The experiments were installed within the period of April to July (2013) and were carried out in two steps, under semi-field and laboratory conditions at the Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University Egypt. Under semi field conditions, one types of nano-silica was tested, namely hydrophilic nano-silica, which applied in six doses 100, 150, 200, 250, 300, 350 ppm. This product was obtained from Nano Tech. Egypt