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Abstract
Phytophthora lateralis causes root rot of Port-Orford cedar (
Chamaecyparis lawsoniana; POC) in native forests of northwest California and southwest Oregon and in landscape plantings of horticultural
Chamaecyparis cultivars in the western US and Europe. In spring 2015, following observations of mortality amongst plant groups in two horticultural nurseries in Oregon,
P. lateralis was isolated from the roots of two additional conifer species:
Microbiota decussata and
Juniperus communis. Species identification was confirmed by sequencing the ITS region using ITS4 and ITS6 primers. To substantiate the extended host range of
P. lateralis, we conducted Koch´s Postulates with the recovered nursery isolates on potted
Juniperus and
Microbiota plants.
Parent Publication
Citation
Rupp, Franziska; Peterson, Ebba K.; Eberhart, Joyce; Parke, Jennifer L. 2017. Host range determination and fungicide resistance assessment of
Phytophthora lateralis isolates from horticultural nurseries in Oregon. In: Frankel, Susan J.; Harrell, Katharine M., tech. coords. Proceedings of the sudden oak death sixth science symposium. Gen. Tech. Rep. GTR-PSW-255. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 85-86.
