1. CSIRO Div. of Plant Industry Cotton Res. Unit, Locked Bag 59 Narrabri NSW Australia 2390
2. Queensland Dep. of Primary Industries Agricultural Production Systems Research Unit (APSRU) 203 Tor St., P.O. Box 102 Toowoomba QLD Austrilia 4350
3. Plant Production Dep. Univ. of Queensland Gatton College Lawes QLD 4343 Australia