Abstract
SYNOPSIS Five pruning schedules were tested using a Latin Square design at the Stormsriver State Forest, Tsitsikamma Forest Region. Treatments included those standard at the time and combinations of prunings at earlier ages or to greater heights. The severity of each pruning regime was expressed with a severity index factor which incorporates the percentage live crown removed, age and mean tree height. Volume increment loss (as much as 16,7%) and the extent of epicormic shoot development were significantly correlated with the index factor. It is concluded that severe pruning of Pinus radiata leads to loss of growth and stimulation of epicormic shoot development. Recommendations are made for an improved pruning regime.
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