الفهرس 
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Abstract
In this study 12 isolates of pink bollworm Pectinophora gossypiella (Saunders) collected from different regions of Egypt. These localities represent upper Egypt (Asyut), middle Egypt (Beni Suef) and lower Egypt (Sharkiya, Dakhliya, Kafr Elsheikh, Gharbiya). In Dakhliya governorate we take different localities (Talkha, Mitghamr, Aga, Mansura, Bilqas, Manzala, Gamalia). <U+25CF> Protein banding patterns visual and cluster analysis showed differences between the studied pink bollworm isolates, suggesting genetic variability among them. <U+25CF>RAPDPCR analysis revealed high genetic relevance of pink bollworms collected from Talkha, Biyala and Manzala areas, which gave the same product patterns. While isolates from Sidfa, Biba, Elmahala and Bilaqas produced completely different patterns, not only from each others, but also from the first group. <U+25CF>The variation in protein banding patterns can be attributed to differences in gene expressions, whereas, RAPDPCR is a clear indication of the insect genome (which is stable from birth to death and not subjected to environment or geographical distribution). <U+25CF>No clearcut correlations were found between cotton cultivars and type of pink bollworm feed on them. <U+25CF> The information should be utilized to design insect control strategies based on genetic differences only.