Master of Science (MS)
Renewable Natural Resources
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.
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Liu, Yaojian, "Study on the termiticidal components of Juniperus virginiana, Chamaecyparis nootkatensis and Chamaecyparis lawsoniana" (2004). LSU Master's Theses. 146.
Todd F. Shupe