Stem growth and oleoresin yield were measured at various ages up to 25 years in a slash pine progeny test. Correlations between measurements taken at 3 and 25 years were weak. But for subsequent measurements (8, 14, and 18 years), the correlations increased rapidly. Findings suggest a relatively short generation interval for advanced generation breeding of slash pine. The greatest genetic gain per year would theoretically be obtained by selecting at 10 years, permitting a generation interval of about 14 years. Forest Sci. 20:225-229.
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Squillace et al. (1974) studied this question.