الفهرس 
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Abstract
Bacillus thuringiensis (Bt) is a spore-forming bacterium well-known for its insecticidal properties associated with its ability to produce crystal inclusions during sporulation. These inclusions are proteins encoded by cry genes and have shown to be toxic to a variety of insects and other organisms like nematodes and protozoa.
Lepidoptera causes some of the most devastating insect pests for important crops in Egypt; their control is a priority as well as a necessity. In this context, use of environmentally safe technology to reduce crop damage like B. thuringiensis would be extremely valuable. Consequently, this study was planned to establish and characterize a collection of Bt isolates from samples collected in different Egyptian localities in order to find novel strains toxic against insect pests of economically important crops.