1. CSIRO Plant Industry and Quality Wheat Cooperative Research Centre Ltd. GPO Box 1600, Canberra, ACT, Australia.
2. Department of Pathology, Columbia University, New York, NY 10032.
3. Australia New Zealand Food Authority, PO Box 7186, Canberra MC 2610 ACT Australia.
4. Australian Centre for International Agricultural Research, GPO Box 1571, Canberra, ACT 2601, Australia.
5. Corresponding author. Phone: +61 2 6217 0559. E-mail: Skerritt@aciar.gov.au