1. Dept. of Postharvest Science of Fresh Produce; ARO, the Volcani Center; P.O. Box 6 Bet Dagan 50250 Israel
2. Faculty of Agricultural; Food and Environmental Quality Sciences; The Hebrew Univ. of Jerusalem; Rehovot 76100 Israel
3. Dept. of Fruit Tree Crops; ARO, the Volcani Center; P.O. Box 6 Bet Dagan 50250 Israel