Phytophthora lateralis

Phytophthora lateralis (Tucker & Milbrath) is a soil-borne plant pathogen that causes cedar root disease in Lawson cypresses, called Port Orford cedar trees (Chamaecyparis lawsoniana ) in Northern USA. This pathogen was first noted to cause disease in around 1920 on nursery stock near Seattle WA. Pacific yew (Taxus brevifolia Nutt.) is also vulnerable to P. lateralis but less susceptible than Port Orford cedar trees, and tree mortality has only been observed in areas where C.