1. Institute of Fundamental Sciences; Massey University; Private Bag 11-222 Palmerston North 4410 New Zealand
2. Department of Botany and Plant Pathology; Oregon State University; Corvallis OR 97331 USA
3. Scion; New Zealand Forest Research Institute Ltd; 49 Sala St, Private Bag 3020 Rotorua 3046 New Zealand
4. Department of Forest and Conservation Sciences; The University of British Columbia; Vancouver BC Canada
5. Horticultural Crops Research Laboratory; USDA Agricultural Research Service; Corvallis OR 97330 USA