Affiliation: | E. F. Walton (corresponding author, e‐mail;), R.‐M. Wu and L. W. Young, HortResearch, Ruakura Research Centre, Private Bag 3123, Hamilton, New Zealand;E. Podivinsky and P. H. S. Reynolds, HortResearch, Palmerston North Research Centre, Private Bag 11–030, Palmerston North, New Zealand. |