المصدر: Ashraf El-Said Mohamed Khalil B.Sc. in Agriculture, Zagazig University, 1985 M.Sc. in Agricultural Zoology (Nematology), Mansoura Univ., 1996 Associate Researcher, Nematology Section, Plant Pathology Institute, Agricultural Research Center. Thesis Submitted in Partial Fulfillment of the Requirements For the Degree of Philosophy Doctor In Agricultural Zoology (Nematology)