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\section{Introduction}  Eucalypt species are fast growing and can produce high quality timber for appearance and structural products including LVL. Large growth-strains displayed in eucalypts are associated with log splitting, warp, collapse and brittleheart, imposing substantial costs on processing (--Yamamoto 2007--). Costly mitigation strategies have been developed to reduce growth-strain induced wood defects that have been only partially effective. With growth-strain being highly heritable, as is shown here an alternative approach is to select and grow individuals which display low growth-strain. Until now it has been difficult, time consuming and expensive to measure growth-strain, preventing the assessment of the large number of trees needed in a successful breeding programme, --mention previous previously the largest reported  study of dundii--. --dundii ref-- conducted growth-strain testing on xxx trees or S OLÓRZANO N ARANJO 2011 et al.