الفهرس 
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Abstract
First, all praise is to ALLAH. The beneficent, the Merciful, without whose
Mercy and guidance this work would never have been started nor completed. I
praise to ALLAH as much as the heavens and earth and what are in between or
behind.
I would like to express my sincere gratitude and appreciation to supervisor to
the present work, Prof. Dr. Mohamed Ali Aflfl Professor of microbiology,
Botany Department, Faculty of Science, Menofia University, for suggestion the
topics of research, planning the study and continuous encouragements. His
efforts in revising the manuscript of this thesis are greatly appreciated.
My sincere thanks and appreciation to my supervisor Prof. Dr. Mahmoud
Swelim, Professor of microbiology, Botany Department, Faculty of Science,
Benha University, for suggestion the topic of research, his kind guidance,
generous encouragement, scientific support and continuous help and his efforts
in revising this manuscript.
Deep thanks and sincere appreciation to Dr. Ibrahim Helmy, assistant
professor of microbiology, Botany department, Faculty of Science, Benha
University, for his sincere encouragement and friendly kind caring.
Many thanks go for Prof. Dr. Mahmoud Hazaa, head of department, for his
sincere encouragement and continuous support.
At last but not at least, I would like to express my deepest thanks to my
husband, and my family for their deep concern, continuous support.