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.
Curry County, Oregon
In 2001, the native tanoak in the county were afflicted by sudden oak death, caused by infection of "Phytophthora ramorum". The pathogen, which by 2016 had killed hundreds of thousands of tanoaks in the county, thrives in moist places along the coast. It has killed other kinds of oaks such as California black oak in a region that includes many California counties as well as Curry County, and it has infected and damaged a variety of conifers and shrubs such as camellia. In Curry County, it threatens timber production, plant nurseries, and Christmas tree farms.