Title: A photographic guide to Acacia koa defects
Author: Lowell, Eini C.; Wiedenbeck, Janice K.; Porterfield, Betsy S.
Source: Gen. Tech. Rep. PNW-GTR-871. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 100 p.
Description: Acacia koa (A. Gray), native to the Hawaiian Islands, has both cultural and economic significance. Koa wood is world-renowned for its extensive use in furniture, tone wood for musical instruments, and other items of cultural importance. Old-growth koa is decreasing in supply, yet dead and dying koa is still being harvested for manufacture of products. Knowledge of wood quality in the trees available for harvest is limited and colloquial in nature. We selected logs from four geographically dispersed sites on the Island of Hawaii. Defects on the face and end surfaces of each log were measured and photographed. The four most commonly occurring defects found were seam, branch, decay (log face), and heart rot. Sawing patterns were recorded so that corresponding defects on lumber could be measured and impact on volume recovery calculated for a specific defect. Included is a pictorial accounting that captures the defect indicators on the exterior of the log and the interior manifestation of the defects as seen in the lumber sawn from the log.
Keywords: Acacia koa, Hawaiian woods, log defect, wood quality, lumber defect
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Lowell, Eini C.; Wiedenbeck, Janice K.; Porterfield, Betsy S. 2013. A photographic guide to Acacia koa defects. Gen. Tech. Rep. PNW-GTR-871. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 100 p.
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