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- Title
Protocol for Heat Treating Black Walnut Wood Infested with Walnut Twig Beetle.
- Authors
Mackes, Kurt; Costanzo, Tara; Coleman, Rocky; Eckhoff, Mike; Vaughan, Damon
- Abstract
Black walnut (Juglans nigra) is one of the most important tree species in the United States for producing lumber and other forest products. However, a recent outbreak of thousand cankers disease vectored by the walnut twig beetle (Pityophthorus juglandis) threatens the population of black walnut in the United States. Infected walnut trees are typically removed to prevent spread of the vector, resulting in large quantities of potential sawlogs that must be sanitized. The objective of this study was to identify the temperature and time combination necessary to heat treat infested materials to 100% beetle mortality. Testing was done on infested sample blocks that contained sapwood and bark. The specimens were heated to various temperatures and examined, both through emergence chambers and destructive sampling, for the presence of P. juglandis at any life stage. Results of the study indicate that heat treating black walnut products to 50.1°C at a depth of 3.8 cm (1.5 in.) for 30 minutes will result in 100 percent beetle mortality. As a side product, this study also produced 3,000 board feet of rough-cut lumber. These boards were heat treated and sold, following the protocol developed in this study. This study demonstrates that wood from black walnut trees infected with thousand cankers disease can be effectively heat sterilized and utilized, reducing the need to chip, landfill, or otherwise dispose of the material without economic return.
- Subjects
UNITED States; EASTERN black walnut; HEAT treatment; SAPWOOD; HEAT sterilization
- Publication
Forest Products Journal, 2016, Vol 66, Issue 5/6, p274
- ISSN
0015-7473
- Publication type
Article
- DOI
10.13073/FPJ-D-14-00082