1. First and fourth authors: The University of Sydney, Plant Breeding Institute, Cobbitty, Private Bag 4011, Narellan, NSW, 2567, Australia; second and fifith authors: Wageningen University and Research Center (WUR), Laboratory of Plant Breeding, 6700 AJ Wageningen, The Netherlands; and third author: Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Box 7026, SE-750 07 Uppsala, Sweden.