Phytophthora ramorum
Trials of silvicultural methods for treating "P. ramorum" began in Humboldt County in northwest coastal California in 2006. The trials have taken place on a variety of infested properties both private and public and have generally focused on varying levels and kinds of host removal. The largest () and most replicated trials have involved removal of tanoak and bay laurel by chainsaw throughout the infested stand, both with and without subsequent underburning designed to eliminate small seedlings and infested leaf litter. Other treatments included host removal in a modified “shaded fuelbreak” design in which all bay laurel is removed, but not all tanoaks; bay and tanoak removal using herbicides; and removal of bay laurel alone. The results of these treatments are still being monitored, but repeated sampling has so far detected only very small amounts of "P. ramorum" in the soil or on vegetation in the treated sites.
Chamaecyparis lawsoniana
"Chamaecyparis lawsoniana" thrives best in well-drained but moist soils, in a fairly sheltered position in full sun.Several hundred named cultivars of varying crown shape, growth rates and foliage colour have been selected for planting in parks and gardens. In the UK the following have gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017):- 
In the wild, the species is seriously threatened by a root disease caused by the introduced oomycete pathogen, "Phytophthora lateralis". This disease is also a problem for horticultural plantings in some parts of North America. The tree is sometimes killed, though less often, by other species of "Phytophthora".