新南威尔士的Coffs Harbour附近的田间试验测量表明,在其近处的人工林中选出的20株优树的自由授粉后代的平均相对材积,比从当地天然林中采集的一般种子大54％。优树子代也比从南非的一个种子园来的14个子代的平均值大43％。这说明新南威尔士的育种计划中,倒引进南非的材料,在树干生长率方面没有什么好处。 Field trial measurements near Coffs Harbor in New South Wales showed that the average relative volume of free-pollinated offspring of the 20 elite trees selected from the plantations in its immediate vicinity was 54% greater than the average seed collected from native natural forests . The elite offspring is also 43% larger than the average of 14 offspring from a seed garden in South Africa. This shows that in New South Wales breeding programs, the materials imported into South Africa are of no benefit in terms of trunk growth rate.