1. French Associates Institute for Agriculture and Biotechnology of Drylands; Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev; Beersheba 849900 Israel
2. Department of Phytopathology and Weed Research; Agricultural Research Organization, Newe Ya'ar Research Center, P.O. Box 1021; Ramat Yishay 30095 Israel