Termites cause serious damage to wood and wood products. In recent years, increasing attention has been paid to extractives from naturally decay resistant trees. In this study, we compared the termiticidal and antifungal effects of extractives from Alaska yellow cedar (AYC), Port-Orford cedar (POC), and Eastern red cedar (ERC). Pentane and Hexane-Acetone extractives from YC and POC, and pentane extractives from ERC were most favorable in terms of termite protection among the extractives we got. Weight loss of strips treated with 5000 ppm pentane extractives from Eastern red cedar, was significantly lower than those treated with solutions of pentane extractive from the other two species of wood at the same concentration or lower concentrations. Wood blocks treated with pentane extractives from ERC also exhibited significantly lower weight loss than other fractions from ERC and from the other two species at 5000 ppm after 3 weeks exposure to brown rot fungi. Weight loss of blocks treated with hexane-acetone extractives was significantly lower than other treatments after 6 and 9 weeks for the white rot decay test.
Comparing the chemical components in the different tree parts in ERC, some difference were found between the needles, bark and the stem of ERC. Cedrol or widdrol were not detected in the extractives from needles extracted by hexane. From the TLC spectra there were small differences between the components in callus induced from ERC and the seedlings. GC-MS spectrum showed smaller types of components and a bigger difference of the peak areas between components in the callus. A higher concentration of cedrol was detected in the callus than that in the original seedlings. Widdrol was not detected in the extractives from callus or seedlings.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-01172004-225708 |
| Date | 20 January 2004 |
| Creators | Liu, Yaojian |
| Contributors | Cornelis de Hoop, Chung-yun Hse, Todd F. Shupe |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-01172004-225708/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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