ibclogo XVI International Botanical Congess


Abstract Number: 2004
Poster No. = 2389


WOOD PROTECTION OF SIX U.S. SPECIES BY NHA: THE WOOD ANATOMICAL PERSPECTIVE OF FUNGAL DECAY


A.C. Wiedenhoeft, R.B. Miller, W. Stockman, and F. Green III, Forest Products Lab., 1 Gifford Pinchot Dr.,Madison, WI 53705


Due to increasing concerns with environmental pollution, wood preservatives that target processes specific to wood decay may be more benign than the broad-spectrum biocides currently in use. We used the low toxicity, calcium precipitating agent N'N-napthaloylhydroxylamine (NHA) to prevent brown- and white-rot decay in lab tests of sapwood of six lumber species. NHA precipitated on the pit membranes of all species studied, presumably binding to structural calcium in pectin. Weight losses in NHA-treated blocks averaged less than 10% compared to an average of more than 45% weight loss in untreated controls. While NHA did reduce weight loss, it did not prevent colonization of the blocks, thus implicating NHA as both a cytotoxic compound and a partial physical barrier to rapid colonization.


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