Production of brown stain in hemlock logs and lumber during storage

Hemlock brown stain is a discoloration that can develop in unseasoned logs and lumber of western hemlock and amabilis fir. This discoloration is a serious problem for producers of high-value Canadian lumber. Production of hemlock brown stain was monitored in freshly felled western hemlock trees and...

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Bibliographic Details
Published in:Forest products journal 1996-04, Vol.46 (4), p.53-58
Main Authors: Kreber, B. (New Zealand Forest Research Institute Ltd., Rotorua, New Zealand.), Byrne, A
Format: Article
Language:English
Subjects:
ABIES AMABILIS
ALMACENAMIENTO
ALMACENAMIENTO DE AGUA
Applied sciences
BOIS
BOIS DEBITE
CHAMPIGNON
Comparative studies
DECOLORACION
DECOLORATION
Degradation and preservation
DENREES ENTREPOSEES
DURACION
DUREE
Exact sciences and technology
Field study
Forest products industry
Fungi
HONGOS
Laboratories
MADERA
MADERA ELABORADA
Methods
Polymer industry, paints, wood
Process planning
PRODUCTOS ALMACENADOS
Stains & staining
STOCKAGE
STOCKAGE D'EAU
Storage
TSUGA HETEROPHYLLA
Wood
Wood. Paper. Non wovens
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Summary:Hemlock brown stain is a discoloration that can develop in unseasoned logs and lumber of western hemlock and amabilis fir. This discoloration is a serious problem for producers of high-value Canadian lumber. Production of hemlock brown stain was monitored in freshly felled western hemlock trees and after storing the logs for 2 and 9 months. Saltwater and dry land storage of logs were evaluated as conditions that influence colorations. Lumber sawn from the 9-month-old logs was also evaluated for color change following storage for 2 months. This study demonstrated that brown stain was associated with extended log storage, particularly in saltwater. Fungi were isolated from freshly felled trees and from logs after 2 months of storage. Dark-pigmented hyphae were associated particularly with areas showing brown stain. Information gained from this study suggested that faster processing of western hemlock logs into lumber could lessen the extent of brown stain problems
ISSN:0015-7473
2376-9637