1. Department of Horticulture, College of Agriculture, Omar Al Mukhtar University, PO Box 991, Bayda, Jabal al Akhdar, Libya.
2. Kansas State University, 1712 Claflin Road, 2021 Throckmorton, Manhattan, KS 66506, USA.
3. Northwestern Washington Research and Extension Center, Washington State University, 16650 SR 536, Mount Vernon, WA 98273, USA.
4. Washington State University, 247 Johnson Hall, PO Box 646420, Pullman, WA 99164-6420, USA.