الفهرس 
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Abstract
This Work Deals With The Study Of Testing The Influence Of Irradiation On The Viability And Virulence Of Bacillus Thuringionsis Var. Thuringiensis And Polyhedrosis Virus Using The Eri-Silk Worm, Philosamia Ricini Boisd. And The Cotton Leafworm Spodoptera Littoralis Boisd. ; Testing The Influence Of Temperature And Relative Humidity On The Response Of The Eri-Silk Worm To Bacillus Thuringiensis Var. Thuringiensis And Polybedrosis Virus. The Influence Of Chemical Insecticides On The Viability And Virulence Of Bacillus Thuringiensis And Polybedrosis Virus, Is Tested Using The Eri-Silk Worm. Philosamia Ricini Boisd. Also, The Influence Of Different Host Plants And Crowding Is Tested On The Incidence Of Natural Diseases And Mortality Among The Eri-Silk Worm And The Cotton Leafworm Spodoptera Littoralis Boisd.