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Abstract
Port-Orford-cedar (
Chamaecyparis lawsoniana (A. Murray) Parl.) (POC) is an economically and ecologically valuable tree in the forests of southwest Oregon and northern California and in the horticultural trade worldwide.
Phytophthora lateralis, the aggressive, invasive cause of POC root disease, was introduced to the native range of POC about 1950, and has since killed trees along roads and streams throughout the forest area where the tree grows. The federal forest management agencies responded with an integrated disease management program designed to slow further spread of the pathogen in order to protect remaining POC and restore the species with planted resistant stock in impacted areas. Various short-term resistance screening methods have been used since the 1980s. Ultimately, in any resistance program, the screening assays have to be ground truthed using field trials and the screening methods updated and refined to assist in resistance evaluations. In this paper we describe and compare the various inoculation methods and screening tests we use to evaluate POC parents and their progenies for resistance and offer evolving insights on their utility. This should provide food for thought for other newer resistance programs working with other pathogens or insects.
Parent Publication
Citation
Hansen, Everett M.; Reeser, Paul; Sutton, Wendy; Sniezko, Richard A. 2012. Methods for screening Port-Orford-cedar for resistance to
Phytophthora lateralis. In: Sniezko, Richard A.; Yanchuk, Alvin D.; Kliejunas, John T.; Palmieri, Katharine M.; Alexander, Janice M.; Frankel, Susan J., tech. coords. Proceedings of the fourth international workshop on the genetics of host-parasite interactions in forestry: Disease and insect resistance in forest trees. Gen. Tech. Rep. PSW-GTR-240. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. pp. 181-188.
