1. a Department of Plant Production, College of Food and Agricultural Science , King Saud University , Riyadh , Saudi Arabia
2. b Department of Horticulture (Pomolgy), Faculty of Agriculture , Kafrelsheikh University , Kafr El-Sheikh , Egypt
3. c Departments of Agriculture and Botany (Agriculture, Microbiology), Faculty of Agriculture , Kafrelsheikh University , Kafr El-Sheikh , Egypt
4. d Department of Citrus , Horticulture Research Institute, A.R.C. , Giza , Egypt