1. Agriculture Western Australia, Locked Bag No. 4, Bentley Delivery Center, WA 6983, Australia.
2. Corresponding author. E-mail: gcrosbie@agric.wa.gov.au
3. BRI Australia Ltd, P.O. Box 7, North Ryde, NSW 2113. Current address: School of Public Health, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia.
4. Nippon Flour Mills Co., Ltd, Central Laboratory 2114-2, Nurumizu, Atsugi, 243 Japan.