The findings of the second evaluation of an international series of teak provenance trials are presented. The report focuses on the results obtained when the trees were 17 years old, but compares the findings with the results at ages of 7-9 to describe the general trend. A description is given of the provenance trials and trial regions; the selection of traits and their assessment, including diameter, branch size and state of health; and statistical analyses of individual trials and across trials are made. Results from the first and second assessment of the individual trials are discussed. These suggest that different seed sources will be superior in different regions. Thai provenances, for instance, seem less attractive in Central America due to below-average growth and adaptation, in contrast to Indonesian and Moist Indian provenances.
