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New Zealand Journal of Forestry (1969) 14(1): 38–49
©New Zealand Institute of Forestry

Research article
Resin Pockets in Canterbury Radiata Pine

N.C. Clifton

Resin pockets are more abundant in radiata pine on the Canterbury Plains than anywhere else in New Zealand.
The defect and the various stages in its development are described.
The effect of resin pockets on grade returns at Ashley Forest is examined and the conclusion is reached that second log pruning in this forest is not justified. It has now been discontinued.
Pruning on the Plains and on exposed downland slopes can only be justified for reasons other than the production of clean timber.
Possible causes of resin pocket formation are discussed. It is concluded that they are initiated when the cambium is ruptured during severe wind sway. This is in line with European findings.

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