Development of gray stain in the sapwood of red beech (Nothofagus fusca) and hard beech (N.
Reports that the enzymeinhibitor sodium azide can prevent this stain (3) further adds to the conclusion that gray stain in red beech probably is non-microbial in nature and would best be characterized as oxidative or enzymemediated.
The objective of this study was to determine whether fumigation of red beech logs of two age groups (time after felling) with sulfuryl fluoride (Vikane) could reduce gray stain in kiln-dried lumber.
Eight red beech logs were harvested at the West Coast of the South Island of New Zealand between 4 and 11 weeks prior to fumigation.
6 times more high-grade lumber (as assessed on the best face) from these younger red beech logs.
Since log age was implicated in the development of gray stain, it might be important to fumigate red beech logs in a fresher condition to further improve stain control by elimination of enzymes or precursors produced in parenchyma cells.