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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