Growth data in 8 years (at the age 1,2,4,5,6,7,8 and 13) from 30 open pollinated families of loblolly pine were analyzed. The results show that phenotypic correlations of growth traits between the age 2 and age 13, age 4 to 8 and age 13 were significant or extremely significant. Genotypic correlation coefficients between ages for growth traits were all large than the corresponding phenotypic correlation coefficients. Early selection can be carried out at the age of 4 years according to the diameter at brea...