1. JOHN HARPER is a Senior Lecturer at the School of Agricultural & Wine Sciences, Charles Sturt University, Locked Bag 588, Boorooma St., Wagga Wagga NSW 2678, Australia; e-mail: jharper@csu.edu.au.
2. GEOFFREY BURROWS is an Associate Professor at the School of Agricultural & Wine Sciences, Charles Sturt University; e-mail: gburrows@csu.edu.au.
3. SERGIO MORONI is a Lecturer at the School of Agricultural & Wine Sciences, Charles Sturt University; e-mail: smoroni@csu.edu.au.
4. ROSANNE QUINNELL is a Senior Lecturer at the School of Biological Science, Faculty of Science, Camperdown, The University of Sydney, NSW 2006, Australia; e-mail: rosanne.quinnell@sydney.edu.au