Assessment of a bark scoring system for resin defects in mature radiata pine

Authors: J. Park
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 2004, Issue N.Z.J.For. 49(4) 2005, pp 36-39, Jan 2005
Publisher: New Zealand Institute of Forestry

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Abstract: Data obtained by sawing pruned log batches from 101 mature stands of radiata pine were used to assess the effectiveness of an external bark scoring system for predicting levels of internal resin defects. The stands represented 15 forests spread through 3 North Island forestry regions. The batches contained 18 to 30 pruned logs, selected in subsets of 6 to span the sawable diameter range, from 3 to 5 sites depending on the size of the stand.
Resin defects were differentiated as 'wet' pockets, 'dry' pockets and streaks with the incidence of each measured as the number per square metre of sawn surface area (no/m2). Analyses were undertaken at the site, stand, forest and regional levels. No robust or practically useful relationships could be derived at any level and it was concluded that the bark score system was an ineffective indicator of potential degrade due to resin defects.

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