Field validation of laboratory tests used in screening Port-Orford-cedar for resistance to Phytophthora lateralis Public Deposited

http://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/9z903449z

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  • Port-Orford-cedar (POC) (Chamaecyparis lawsoniana (A. Murl.) Parl) is an important tree species native the coastal ranges of southern Oregon and northern California. The tree is a false-cedar in the cypress (Cupressaceae) family and is used for timber and planted as an ornamental. The tree in most of its native range is now being threatened by the exotic pathogen Phytophthora lateralis. Since it's introduction into the wild in the 1950s and `60s, P. lateralis has spread over much of the natural historic range (Jules et al. 2002). Starting in the late 1980's, a resistance breeding program was started to preserve POC as a valuable species of tree. The resistance screening program is still operating and has been successful in finding and producing resistant seed stock. This thesis focuses on the resistance screening techniques used and evaluating their effectiveness at predicting tree survival in the wild.
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