Phytophthora lateralis : Observatree guides

Phytophthora lateralis is an aggressive fungus-like pathogen that causes extensive damage mainly to Lawson cypress trees (Chamaecyparis lawsoniana). Lawson cypress and its numerous colourful varieties are frequently planted for amenity, and are among the most important conifers in the UK ornamental plant trade. The pathogen primarily attacks the roots of its hosts, and forms lesions which extend up into the root collar and stem base. The disease is nearly always fatal and can have a major impact on trees in woodlands, windbreaks, parkland, private gardens and nurseries.