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Title: Acoustic assessment of stress level and potential wood quality of logs affected by oak decline

Source: 15th Central Hardwood Forest Conference : proceedings of a conference held at the University of Tennessee, Knoxville, TN, February 27-March 1, 2006. Asheville, NC : U.S. Dept. of Agriculture, Forest Service, Southern Research Station, 2007. General techn

Author(s)Wang, Xiping; Stelzer, Henry E.; Wiedenbeck, Jan; Ross, Robert J.

Publication Year: 2007  View PDF »

Related Publications: view

Category: Journal Articles
Associated Research Project(s):   FPL-4714-2A

Abstract: Large numbers of black oak (Quercus velutina Lam.) and scarlet oak (Q. coccinea Muenchh.) trees are declining and dying in the Missouri Ozark forest as a result of oak decline. Infested trees produce low-grade logs that become extremely problematic to merchandize as the level of insect attack increases in the forest stand. The objective of this study was to investigate the use of a resonance acoustic technique to assess the stress or infestation level of logs affected by oak decline and evaluate potential grade yield of boards obtained from those logs. Following the acoustical testing of 400 black and scarlet oak butt logs obtained from four different stands, the majority of the logs were sawn into 4/4 boards and visually graded based on the local mill standards. A sub-sample of the logs were sawn into 8/4 boards, inspected for defects, and then computer-graded according to the National Hardwood Lumber Association Rules. The results of this study showed a positive relationship between acoustic velocity and grade yield of borer infested logs, suggesting that the resonance acoustic tool can be effectively used to segregate borer infested logs for efficient operation. The poor grade out projected by the computer program is evidence of the poor quality of the oak-decline affected trees in the region. However, the grades imposed by the local mill graders indicate that some of the material could be used for flooring, and virtually all of the material could be used to make pallet and industrial blocking grade products.

Keywords: Wood, biodegradation, deterioration, diseases and pests, grading, red oak, black oak, nondestructive testing, mechanical properties, oak, grading, acoustic properties, quality, nondestructive testing, insect pests, resistance to decay, decay, logs, acoustic testing

File size: 1 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 1174
Current FPL Scientists associated with this product (listed alphabetically)
Ross, Robert J.
Supervisory Research Gen. Engineer
Wang, Xiping
Research Forest Products Technologist

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